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Koashvite

A valid IMA mineral species
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00231880017271924288001.jpg
Koashvite

Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia
00231880017271924288001.jpg
Koashvite

Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia
00231880017271924288001.jpg
Koashvite

Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia
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About KoashviteHide

05224900017271924322844.jpg
View into the open pit

Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia
Formula:
Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O
Colour:
Pale yellow
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
2.98 - 3.02
Crystal System:
Orthorhombic
Name:
Named by Y.L. Kapustin, Z.V. Pudovkina, A.V. Bykova, and G.V. Lyubomilova in 1974 for the type locality of Koashva Open Pit, Russia, an important locality that is the type locality for many minerals.
Lovozerite Group. A possible trigonal polymorph is known as 'UM1980-20-SiO:CaFeHMnNaTi'.


Unique IdentifiersHide

Mindat ID:
2230
Long-form identifier:
mindat:1:1:2230:5

IMA Classification of KoashviteHide

Classification of KoashviteHide

Strunz-mindat (2025):
9.CJ.15c

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
Dana 8th ed.:
61.1.2b.2

61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Hey's CIM Ref.:
14.9.38

14 : Silicates not Containing Aluminum
9 : Silicates of Ti

Mineral SymbolsHide

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

SymbolSourceReference
KoaIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KoashviteHide

Lustre:
Vitreous
Transparency:
Transparent
Colour:
Pale yellow
Hardness:
6 on Mohs scale
Hardness:
VHN20=680 - 740 kg/mm2 - Vickers
Fracture:
Conchoidal
Density:
2.98 - 3.02 g/cm3 (Measured)    3.069 g/cm3 (Calculated)

Optical Data of KoashviteHide

Type:
Biaxial (-)
RI values:
nα = 1.637 nβ = 1.643 nγ = 1.648
2V:
Measured: 82° to 84°, Calculated: 84°
Max Birefringence:
δ = 0.011
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak

Chemistry of KoashviteHide

Mindat Formula:
Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O
Elements listed:
Ca, Fe, H, Mn, Na, O, Si, Ti - search for minerals with similar chemistry
Common Impurities:
Mg,K

Crystallography of KoashviteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 10.179(1) Å, b = 20.899(2) Å, c = 7.335(1) Å
Ratio:
a:b:c = 0.487 : 1 : 0.351
Unit Cell V:
1,560.38 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space Group: Pmnb

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.581 Å(100)
1.820 Å(70)
3.66 Å(50)
3.28 Å(50)
1.504 Å(50)
2.620 Å(40)
1.476 Å(40)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of KoashviteHide

Type Locality:
ⓘ Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 75148; National School of Mines, Paris, France.
Geological Setting of Type Material:
veinlets replacing lomonosovite
Associated Minerals at Type Locality:
LomonosovitePectoliteVilliaumiteNatrophosphate
Reference:
Kapustin, Y.L., Pudovkina, Z.V., Bykova, A.V., Lyubomilova, G.V. (1974) Koashvite, a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 103: 559-566.

Synonyms of KoashviteHide

Other Language Names for KoashviteHide

German:Koashvit
Spanish:Koashvita

Relationship of Koashvite to other SpeciesHide

Related Minerals - Strunz-mindat GroupingHide

9.CJ.ZolotareviteNa5Zr[Si6O15(OH)3] · 3H2OTrig. 3m (3 2/m) : R3m
9.CJ.AvdeeviteNaAl4(Be5Li)(Si6O18)2(H2O)1-2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.CJ.Beryllocordierite-NaNaMg4(Al5Be)(AlSi5O18)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.Beryllosachanbińskiite-NaNaMn4(Al5Be)(AlSi5O18)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.NakkaalaaqiteK2[Na3Ca]LiCa2Ti2Be4Si12O38Orth. mmm (2/m 2/m 2/m) : Fddd
9.CJ.05JohnkoivulaiteCs[Be2B]Mg2Si6O18Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05BazziteBe3Sc2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05Ferroindialite(Fe2+,Mg)2Al4Si5O18Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05 vaVorobyeviteBe3Al2(Si6O18)
9.CJ.05StoppaniiteBe3Fe3+2(Si6O18) · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05IndialiteMg2Al3(AlSi5O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.10Sekaninaite(Fe,Mg)2Al3(AlSi5O18)Orth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.10Cordierite(Mg,Fe)2Al3(AlSi5O18)Orth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.15aZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)Trig. 3m (3 2/m) : R3m
9.CJ.15aKapustiniteNa6ZrSi6O16(OH)2Mon. 2/m : B2/m
9.CJ.15aTownenditeNa8ZrSi6O18Trig. 3m (3 2/m) : R3m
9.CJ.15aCombeiteNa4.5Ca3.5Si6O17.5(OH)0.5Trig. 3m (3 2/m) : R3m
9.CJ.15aKazakoviteNa6Mn2+Ti(Si6O18)Trig. 3m (3 2/m) : R3m
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2OTrig. 3m (3 2/m)
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OTrig. 3 : R3
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6Mon. m : Bm
9.CJ.15bImandriteNa12Ca3Fe3+2(Si6O18)2Orth. mmm (2/m 2/m 2/m)
9.CJ.25BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2Mon. 2/m : B2/b
9.CJ.25AleksandroviteKCa7Sn2Li3Si12O36F2Mon. 2/m : B2/b
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2Mon. 2/m : B2/b
9.CJ.30DioptaseCuSiO3 · H2OTrig. 3 : R3
9.CJ.35KostyleviteK2Zr(Si3O9) · H2OMon. 2/m : P21/b
9.CJ.40PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
9.CJ.45Gerenite-(Y)(Ca,Na)2(Y,REE)3Si6O18 · 2H2OTric. 1 : P1
9.CJ.50OdintsoviteK2Na4Ca3Ti2Be4Si12O38Orth. mmm (2/m 2/m 2/m) : Fddd
9.CJ.55MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6Trig.
9.CJ.60PezzottaiteCs(Be2Li)Al2(Si6O18)Trig. 3 : R3

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for KoashviteHide

References for KoashviteHide

Localities for KoashviteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Murmansk Oblast
    • Khibiny Massif
      • Koashva Mt
[World of Stones 95:5-6 +2 other references
Pekov (1998)
      • Yukspor Mt
Khomyakov et al. (1983)
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