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Andradite

A valid IMA mineral species - grandfathered
This page kindly sponsored by Robert M. Hazen
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About AndraditeHide

08929590017271921078645.jpg
José Bonifácio de Andrada e Silva
Formula:
Ca3Fe3+2(SiO4)3
Colour:
Yellow, greenish yellow to emerald-green, dark green; brown, brownish red, brownish yellow; grayish black, black; may be sectored
Lustre:
Adamantine, Resinous, Dull
Hardness:
6½ - 7
Specific Gravity:
3.8 - 3.9
Crystal System:
Isometric
Name:
Named in 1868 by James Dwight Dana in honor of José Bonifácio de Andrada e Silva [June 13, 1763 Santos, Brazil - April 6, 1838 Niterói, Brazil], Brazilian mineralogist, who first described and named what Dana (1868) defined as a subvariety of andradite. d'Andrada had earlier, in 1800, discovered a yellowish-grey mineral from a mine (Wirum?) near Drammen, Buskerud, Norway. He described and named this mineral under the name allochroite (d'Andrada 1800), from the Greek αλλος, another, and χροια, colour, due to the change of colour of the heated product (with sodium ammonium hydrogen phosphate, reagent in blowpipe analysis) when cooling.
Andradite-Grossular Series, Andradite-Schorlomite Series, Andradite-Uvarovite Series.

Andradite is found in skarns from contact metamorphosed impure limestones or calcic igneous rocks; in chlorite schists and serpentinites; in alkalic igneous rocks, then typically titaniferous.




Unique IdentifiersHide

Mindat ID:
223
Long-form identifier:
mindat:1:1:223:5

IMA Classification of AndraditeHide

Classification of AndraditeHide

9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
51.4.3b.1

51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in [6] and >[6] coordination
14.22.9

14 : Silicates not Containing Aluminum
22 : Silicates of Fe and Ca

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
AdrIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
AdrKretz (1983)Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277–279.
AdrSiivolam & Schmid (2007)Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download
AdrWhitney & Evans (2010)Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371
AdrThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Pronunciation of AndraditeHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of AndraditeHide

Adamantine, Resinous, Dull
Transparency:
Transparent, Translucent
Colour:
Yellow, greenish yellow to emerald-green, dark green; brown, brownish red, brownish yellow; grayish black, black; may be sectored
Comment:
One color changes from green in the presence of daylight to brown under incandescent light; the other color changes from yellow–green to orange. According to the chemical compositional analysis, unlike common andradite garnets, color-changing garnets have a high content of Fe2+, and their contents of Cr and/or V (common elements leading to the alexandrite-like effect) and Ce + Nd are very low. In the UV–Vis–NIR spectra, the wide absorption band near 575 nm is produced by the spin-forbidden transition (5Eg → 3T1g and 5Eg → 3E1g) of eightfold-coordinated high-spin Fe2+, leading to the emergence of transmission windows in the green (centered at 525 nm) and red (above 650 nm) regions, which is the main reason for the alexandrite-like effect of the color-changing andradite. Appears to be from a skarn deposit.[[1]]
Streak:
White
Hardness:
6½ - 7 on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.8 - 3.9 g/cm3 (Measured)    3.859 g/cm3 (Calculated)

Optical Data of AndraditeHide

Type:
Isotropic
RI values:
n = 1.887
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High
Anisotropism:
Typically weak

Chemistry of AndraditeHide

Mindat Formula:
Ca3Fe3+2(SiO4)3
Element Weights:
Element% weight
O37.781 %
Ca23.660 %
Fe21.979 %
Si16.580 %

Calculated from ideal end-member formula.
Common Impurities:
Ti,Cr,Al,Mg

Chemical AnalysisHide

Oxide wt%:
 12345678
SiO237.74 %35.69 %35.51 %34.90 %35.94 %35.52 %35.75 %32.79 %
TiO20.81 %0.041 %0.04 %0.01 %0.02 %0.1 %
Al2O38.26 %0.73 %0.11 %0.01 %0.08 %0.02 %0.14 %0.02 %
Cr2O32.52 %0.025 %1.1 %
FeO14 %
MnO0.09 %0.02 %0.01 %0.01 %0.01 %0.02 %0.02 %
MgO0.46 %0.26 %0.08 %0.30 %0.06 %0.21 %0.08 %
CaO34.47 %33.48 %33.04 %32.95 %33.38 %32.84 %33.40 %35.22 %
Fe2O330.06 %30.19 %31.54 %31.54 %31.23 %30.79 %29.81 %
Na2O0.05 %0.02 %
K2O0.02 %
V2O30.02 %0.02 %
Total:98.35 %100.026 %100.27 %99.56 %101.26 %99.68 %100.37 %98.06 %
Sample references:
IDLocalityReferenceNotes
1Belqeys Mountain, Takab County, West Azerbaijan Province, IranEMPA analysis of green "demantoid" from Baba Nazar, Iran, Sample B14-1
2Dossi di Franscia, Franscia, Lanzada, Sondrio Province, Lombardy, ItalyGreen idiomorphic crystal (3mm) seated on fissure wall. Demantid variety. Analysed by microprobe
3Sferlùn asbestos mine, Vallone del Cengiaccio, Lanzada, Sondrio Province, Lombardy, ItalyAnalysis of green andradite ( demantoid). Data from Corbelli, C. (1992). Studio cristallografico e composizionale di alcuni termini della serie dei granati. Doctoral thesis, University of Milano.
4Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja, Diana, MadagascarEMPA analysis of green andradite (demantoid).
5  "  "EMPA analysis of yellowish green andradite (demantoid).
6  "  "EMPA analysis of brown andradite (topazolite)
7Muslim Bagh, Killa Saifullah District, Balochistan, PakistanEMPA analysis of peridotite hosted andradite (demantoid) from the vicinity of Muslim Bagh.
8Poldnevaya village, Polevskoy, Sverdlovsk Oblast, RussiaEMPA analysis of dark green andradite (demantoid)

Crystallography of AndraditeHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Ia3d
Cell Parameters:
a = 12.056 Å
Unit Cell V:
1,752.31 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Commonly well-crystallized dodecahedra, trapezohedra, or combinations, to 5 cm. Also granular to massive.
Comment:
Al-Fe ordered variants may show space groups I-1 (subgroup of Ia3d) or Fddd (Kingma & Downs, 1989).

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000246AndraditeNovak G A, Gibbs G V (1971) The crystal chemistry of the silicate garnets sample An American Mineralogist 56 791-8231971Valmalen, Italy0293
0001207AndraditeHazen R M, Finger L W (1989) High-pressure crystal chemistry of andradite and pyrope: Revised procedures for high-pressure diffraction experiments sample in air American Mineralogist 74 352-35919890293
0001208AndraditeHazen R M, Finger L W (1989) High-pressure crystal chemistry of andradite and pyrope: Revised procedures for high-pressure diffraction experiments American Mineralogist 74 352-35919892293
0001209AndraditeHazen R M, Finger L W (1989) High-pressure crystal chemistry of andradite and pyrope: Revised procedures for high-pressure diffraction experiments American Mineralogist 74 352-35919893293
0001210AndraditeHazen R M, Finger L W (1989) High-pressure crystal chemistry of andradite and pyrope: Revised procedures for high-pressure diffraction experiments American Mineralogist 74 352-35919895293
0001211AndraditeHazen R M, Finger L W (1989) High-pressure crystal chemistry of andradite and pyrope: Revised procedures for high-pressure diffraction experiments American Mineralogist 74 352-359198912.5293
0001212AndraditeHazen R M, Finger L W (1989) High-pressure crystal chemistry of andradite and pyrope: Revised procedures for high-pressure diffraction experiments American Mineralogist 74 352-359198919293
0001252AndraditeLager G A, Armbruster T, Rotella F J, Rossman G R (1989) OH substitution in garnets: X-ray and neutron diffraction, infrared, and geometric-modeling studies sample SB-1 American Mineralogist 74 840-85119890293
0001253AndraditeLager G A, Armbruster T, Rotella F J, Rossman G R (1989) OH substitution in garnets: X-ray and neutron diffraction, infrared, and geometric-modeling studies sample SB-2 American Mineralogist 74 840-85119890293
0001254AndraditeLager G A, Armbruster T, Rotella F J, Rossman G R (1989) OH substitution in garnets: X-ray and neutron diffraction, infrared, and geometric-modeling studies sample SB-3 American Mineralogist 74 840-85119890293
0001281AndraditeKingma K J, Downs J W (1989) Crystal-structure analysis of a birefringent andradite American Mineralogist 74 1307-131619890293
0003948AndraditeGaluskina I O, Galuskin E V, Dzierzanowski P, Armbruster T, Kozanecki M (2005) A natural scandian garnet American Mineralogist 90 1688-169220050293
0006469AndraditeArmbruster T, Geiger C A (1993) Andradite crystal chemistry, dynamic X-site disorder and structural strain in silicate garnets European Journal of Mineralogy 5 59-7119930293
0006470AndraditeArmbruster T, Geiger C A (1993) Andradite crystal chemistry, dynamic X-site disorder and structural strain in silicate garnets European Journal of Mineralogy 5 59-7119930293
0006471AndraditeArmbruster T, Geiger C A (1993) Andradite crystal chemistry, dynamic X-site disorder and structural strain in silicate garnets European Journal of Mineralogy 5 59-7119930293
0006472AndraditeArmbruster T, Geiger C A (1993) Andradite crystal chemistry, dynamic X-site disorder and structural strain in silicate garnets European Journal of Mineralogy 5 59-7119930293
0006473AndraditeArmbruster T, Geiger C A (1993) Andradite crystal chemistry, dynamic X-site disorder and structural strain in silicate garnets European Journal of Mineralogy 5 59-7119930293
0006606AndraditeArmbruster T (1995) Structure refinement of hydrous andradite, Ca3Fe1.54Mn0.02Al0.26(SiO4)1.65(O4H4)1.35, from the Wessels mine, Kalahari manganese field, South Africa European Journal of Mineralogy 7 1221-12251995Wessels mine, Kalahari manganese field, South Africa0293
0006754AndraditeArmbruster T, Birrer J, Libowitzky E, Beran A (1998) Crystal chemistry of Ti-bearing andradites European Journal of Mineralogy 10 907-9211998Baden-Wurtemburg, Germany0293
0006755AndraditeArmbruster T, Birrer J, Libowitzky E, Beran A (1998) Crystal chemistry of Ti-bearing andradites European Journal of Mineralogy 10 907-9211998Baden-Wurtemburg, Germany0293
0006756AndraditeArmbruster T, Birrer J, Libowitzky E, Beran A (1998) Crystal chemistry of Ti-bearing andradites European Journal of Mineralogy 10 907-9211998N'Zala, Atlas mountains, Morocco0293
0006757AndraditeArmbruster T, Birrer J, Libowitzky E, Beran A (1998) Crystal chemistry of Ti-bearing andradites European Journal of Mineralogy 10 907-9211998Zermatt, Valais, Switzerland0293
0006758AndraditeArmbruster T, Birrer J, Libowitzky E, Beran A (1998) Crystal chemistry of Ti-bearing andradites European Journal of Mineralogy 10 907-9211998Schaffhausen area, Switzerland0293
0006759AndraditeArmbruster T, Birrer J, Libowitzky E, Beran A (1998) Crystal chemistry of Ti-bearing andradites European Journal of Mineralogy 10 907-9211998Okahandja, Namibia0293
0006944AndraditeAgrosi G, Schingaro E, Pedrazzi G, Scandale E, Scordari F (2002) A crystal chemical insight into sector zoning of a titanian andradite ('melanite') crystal European Journal of Mineralogy 14 785-79420020293
0006945AndraditeAgrosi G, Schingaro E, Pedrazzi G, Scandale E, Scordari F (2002) A crystal chemical insight into sector zoning of a titanian andradite ('melanite') crystal European Journal of Mineralogy 14 785-79420020293
0006946AndraditeAgrosi G, Schingaro E, Pedrazzi G, Scandale E, Scordari F (2002) A crystal chemical insight into sector zoning of a titanian andradite ('melanite') crystal European Journal of Mineralogy 14 785-79420020293
0007860AndraditeWoodland A B, Ross C R (1994) A crystallographic and Mossbauer spectroscopy study of Fe3Al2Si3O12-Fe3Fe2Si3O12, (Almandine-"Skiagite") and Ca3Fe2Si3O12-Fe3Fe2Si3O12 (Andradite-"Skiagite") garnet solid solutions Physics and Chemistry of Minerals 21 117-13219940293
0007864AndraditeWoodland A B, Ross C R (1994) A crystallographic and Mossbauer spectroscopy study of Fe3Al2Si3O12-Fe3Fe2Si3O12, (Almandine-"Skiagite") and Ca3Fe2Si3O12-Fe3Fe2Si3O12 (Andradite-"Skiagite") garnet solid solutions Physics and Chemistry of Minerals 21 117-13219940293
0007865AndraditeWoodland A B, Ross C R (1994) A crystallographic and Mossbauer spectroscopy study of Fe3Al2Si3O12-Fe3Fe2Si3O12, (Almandine-"Skiagite") and Ca3Fe2Si3O12-Fe3Fe2Si3O12 (Andradite-"Skiagite") garnet solid solutions Physics and Chemistry of Minerals 21 117-13219940293
0009894AndraditePilati T, Demartin F, Gramaccioli C M (1996) Atomic displacement parameters for garnets: A lattice-dynamical evaluation Acta Crystallographica B52 239-2501996Val Malenco, Italy0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Loading XRD data...
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
3.015 Å(60)
2.696 Å(100)
2.462 Å(45)
1.9564 Å(25)
1.6728 Å(25)
1.6112 Å(60)
1.1195 Å(25)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration4.566-4.550
6 : Secondary asteroid phases4.566-4.560
Near-surface Processes
26 : Hadean detrital minerals
High-𝑇 alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks
36 : Carbonatites, kimberlites, and related igneous rocks
Stage 5: Initiation of plate tectonics<3.5-2.5
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
51 : Pyrometamorphic minerals (see also #54 and #56)<0.36
Geological Setting:
In skarns from contact metamorphosed impure limestones or calcic igneous rocks; in chlorite schists and serpentinites; in alkalic igneous rocks, then typically titaniferous.

Type Occurrence of AndraditeHide

Synonyms of AndraditeHide

Other Language Names for AndraditeHide

Varieties of AndraditeHide

BredbergiteA green magnesian variety of andradite [Dana, 1868, 270 "Syst. Min., 5th Ed."]

Originally described from Sala Silver Mine, Sala, Västmanland, Sweden.
ColophoniteA coarsely granular variety of brown, yellow-orange or reddish garnet, usually andradite. An early chemical analysis [Simon, 1807] of "colophonite" from "nordisches Gegenden" [Nordic regions], probably Arendal iron mines, Norway, was neither of type mate...
DemantoidA green variety of andradite.

Originally described from Telyanskaya River, Kamennaya Telyana, Nizhnii-Tagil (Mednorudyanskoye) Cu Deposit, Nizhnii Tagil, Sverdlovskaya Oblast', Urals Region, Russia (https://www.mindat.org/loc-2803.html).

"Horsetail" in...
HydroandraditeA hydroxyl-bearing variety (OH- mainly replaces Si).
Compare hydrogrossular.
MelaniteA black Ti-bearing (up to 11.5 mass% TiO2, but usually <~5 mass%) variety of Andradite.

There are probably solid solution series to schorlomite [Ca3Ti2(SiO4)(Fe3+O4)2] and morimotoite [Ca3(TiFe2+)(SiO4)3], but note widely different formulae despite both ...
PolyadelphiteA red-brown, golden brown, or yellow-brown variety of Mn-bearing andradite.
Rainbow GarnetA trade name for a variety of andradite showing a distinct iridescence in rainbow colours.

The iridescence is caused by the interference of white light with an overgrowth built of very thin lamellae, oriented parallel to {110} or other crystal faces. The...
Tin-bearing AndraditeA Sn-bearing variety of andradite.
Titanium-bearing AndraditeA brown coloured Ti-bearing andradite, distinguished from the black Melanite high-Ti (up to 11.5 mass.% TiO2) variety of Andradite garnet.
TitanmelaniteA black Ti-bearing andradite (cf. also melanite) approaching schorlomite in composition, garnet group.
TopazoliteA variety of Andradite resembling Topaz (in colour and transparency).
YttergranatY-bearing variety of andradite.

Relationship of Andradite to other SpeciesHide

Other Members of Garnet Group:
AlmandineFe2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
BlythiteMn2+3Mn3+2[SiO4]3
CalderiteMn2+3Fe3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
EringaiteCa3Sc2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
GoldmaniteCa3V3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
GrossularCa3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
KhohariteMg3Fe3+2(SiO4)3
KnorringiteMg3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
MajoriteMg3(MgSi)(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
Menzerite-(Y)(Y2Ca)Mg2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
MomoiiteMn2+3V3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
MorimotoiteCa3(TiFe2+)(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
PyropeMg3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
RubiniteCa3Ti3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
SkiagiteFe2+3Fe3+2[SiO4]3
SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
UvaroviteCa3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
499 photos of Andradite associated with CalciteCaCO3
422 photos of Andradite associated with QuartzSiO2
372 photos of Andradite associated with Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
268 photos of Andradite associated with HematiteFe2O3
266 photos of Andradite associated with WillemiteZn2SiO4
262 photos of Andradite associated with HausmanniteMn2+Mn3+2O4
200 photos of Andradite associated with HedenbergiteCaFe2+Si2O6
161 photos of Andradite associated with DiopsideCaMgSi2O6
160 photos of Andradite associated with ClinochloreMg5Al(AlSi3O10)(OH)8
160 photos of Andradite associated with MagnetiteFe2+Fe3+2O4

Related Minerals - Strunz-mindat GroupingHide

9.AD.AdrianiteCa12(Al4Mg3Si7)O32Cl6Iso. 4 3m : I4 3d
9.AD.05LarniteCa2SiO4Mon. 2/m
9.AD.10Calcio-olivineCa2SiO4Orth. mmm (2/m 2/m 2/m)
9.AD.15MerwiniteCa3Mg(SiO4)2Mon. 2/m : P21/b
9.AD.20BredigiteCa7Mg(SiO4)4Orth. mm2 : Pnn2
9.AD.25MidbariteCa3Mg2(V2Si)O12Iso. m3m (4/m 3 2/m)
9.AD.25Menzerite-(Y)(Y2Ca)Mg2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25UvaroviteCa3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25EltyubyuiteCa12Fe3+10Si4O32Cl6Iso. 4 3m : I4 3d
9.AD.25EringaiteCa3Sc2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HenritermieriteCa3Mn3+2(SiO4)2[◻(OH)4]Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AD.25 vaHydrougrandite(Ca,Mg,Fe2+)3(Fe3+,Al)2[(OH)4(SiO4)2]Iso.
9.AD.25CalderiteMn2+3Fe3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25NikmelnikoviteCa12(Fe2+Fe3+3Al3◻)[SiO4]6[◻(OH)4]54Trig. 3 : R3
9.AD.25HutcheoniteCa3Ti2(SiO4)(AlO4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3Iso. 4 3m : I4 3d
9.AD.25RubiniteCa3Ti3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HoltstamiteCa3Al2(SiO4)2[◻(OH)4]Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AD.25SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25KimzeyiteCa3Zr2(SiO4)(AlO4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25KhohariteMg3Fe3+2(SiO4)3
9.AD.25IrinarassiteCa3Sn2(SiO4)(AlO4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25KnorringiteMg3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25GoldmaniteCa3V3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25BlythiteMn2+3Mn3+2[SiO4]3
9.AD.25SkiagiteFe2+3Fe3+2[SiO4]3
9.AD.25UM1984-37-SiO:CrMnMn2+3Cr3+2(SiO4)3
9.AD.25AlmandineFe2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25 vaYamatoite(Mn2+,Ca)3(V3+,Al)2(SiO4)3Iso.
9.AD.25MomoiiteMn2+3V3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25GrossularCa3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25MorimotoiteCa3(TiFe2+)(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25MajoriteMg3(MgSi)(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25PyropeMg3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25SchorlomiteCa3Ti2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.30HafnonHf(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30CoffiniteU(SiO4) · nH2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30ThoriteTh(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30 vaAuerlitenear Th(Si,P)O4
9.AD.30Stetindite-(Ce)Ce(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2xMon.
9.AD.35HuttoniteThSiO4Mon. 2/m
9.AD.40EulytineBi4(SiO4)3Iso. 4 3m : I4 3d
9.AD.45ReiditeZr(SiO4)Tet. 4/m : I41/a
9.AD.55JeffbeniteMg3Al2Si3O12Tet. 4 2m : I4 2d

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Health Risks:
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Andradite in petrologyHide

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References for AndraditeHide

Reference List:

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