Vuoriyarvite-K
A valid IMA mineral species
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About Vuoriyarvite-K
Formula:
K2(Nb,Ti)2(Si4O12)(O,OH)2 · 4H2O
Colour:
White
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
2.95
Crystal System:
Monoclinic
Member of:
Name:
For the type locality, Vuoriyarvi alkai-ultrabasic massif, Kola Peninsula, Russia. Originally named simply vuoriyarvite, the suffix was added by the IMA in 2002 to denote the dominant extra-framework cation (potassium, in this case), following the recommended nomenclature for labuntsovite-group minerals.
Unique Identifiers
Mindat ID:
7359
Long-form identifier:
mindat:1:1:7359:8
IMA Classification of Vuoriyarvite-K
Approved
IMA status notes:
Renamed by the IMA
IMA Formula:
(K,Na,◻)12Nb8(Si4O12)4O8 · 12-16H2O
Approval year:
1995
First published:
1998
Classification of Vuoriyarvite-K
9.CE.30b
9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
Dana 7th ed.:
78.0.0.0
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Vyv-K | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Vuoriyarvite-K
Vitreous
Transparency:
Translucent
Colour:
White
Streak:
White
Hardness:
4½ on Mohs scale
Hardness:
VHN30=315 - 435 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
None
None
Parting:
Weak parting perpendicular to the elongation.
Fracture:
Irregular/Uneven
Density:
2.95(2) g/cm3 (Measured) 3.02(1) g/cm3 (Calculated)
Optical Data of Vuoriyarvite-K
Type:
Biaxial (+)
RI values:
nα = 1.649(2) nβ = 1.655(3) nγ = 1.759(3)
2V:
Measured: 20° (5)
Max. Birefringence:
δ = 0.110
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
Weak, r < v.
Optical Extinction:
Z = c; X = b.
Comments:
Negative elongation.
Chemistry of Vuoriyarvite-K
Mindat Formula:
K2(Nb,Ti)2(Si4O12)(O,OH)2 · 4H2O
Element Weights:
Common Impurities:
Na
Crystallography of Vuoriyarvite-K
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bm
Setting:
Cm
Cell Parameters:
a = 14.692(4) Å, b = 14.164(4) Å, c = 7.859(3) Å
β = 117.87(2)°
β = 117.87(2)°
Ratio:
a:b:c = 1.037 : 1 : 0.555
Unit Cell V:
1,445.74 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.10 Å | (90) |
| 4.98 Å | (60) |
| 3.262 Å | (10) |
| 3.151 Å | (80b) |
| 2.956 Å | (60) |
| 2.549 Å | (40) |
| 1.723 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Vuoriyarvite-K
General Appearance of Type Material:
Tabular crystals up to 3 mm long, showing {h01} and pinacoids {001} and {100}.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Moscow, Russia.
Associated Minerals at Type Locality:
Synonyms of Vuoriyarvite-K
Other Language Names for Vuoriyarvite-K
German:Vuoriyarvit-K
Relationship of Vuoriyarvite-K to other Species
Member of:
Other Members of Vuoriyarvite Group:
| Tsepinite-Ca | (Ca,K,Na)2-x(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O | Mon. 2/m : B2/m |
| Tsepinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. m : Bm |
| Tsepinite-Na | Na2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. m : Bm |
| Tsepinite-Sr | Sr(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. m : Bm |
Related Minerals - Strunz-mindat Grouping
| 9.CE. | Dutkevichite-(Ce) | NaZnBa2Ce2Ti2Si8O26F · H2O |
| 9.CE. | Katanite | Ba3NbFe3Si2O14 |
| 9.CE. | Niobobaotite | Ba4(Ti2.5Fe2+1.5)Nb4Si4O28Cl |
| 9.CE. | Amaterasuite | Sr4Ti6Si4O23(OH)Cl |
| 9.CE. | Steiningerite | Ba2Zr2(Si4O12)O2 |
| 9.CE.05 | Papagoite | CaCu[H3AlSi2O9] |
| 9.CE.10 | Verplanckite | Ba4Mn2+2Si4O12(OH,H2O)3Cl3 |
| 9.CE.15 | Baotite | Ba4(Ti,Nb,W)8O16(SiO3)4Cl |
| 9.CE.20 | Nagashimalite | Ba4(V,Ti)4B2Si8O27(O,OH)2Cl |
| 9.CE.20 | Taramellite | Ba4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2Clx |
| 9.CE.20 | Titantaramellite | Ba4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx |
| 9.CE.25 | Bario-orthojoaquinite | (Ba,Sr)4Fe2Ti2[Si4O12]2O2 · H2O |
| 9.CE.25 | Byelorussite-(Ce) | NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2O |
| 9.CE.25 | Joaquinite-(Ce) | NaBa2Ce2FeTi2[Si4O12]2O2(OH,F) · H2O |
| 9.CE.25 | Orthojoaquinite-(La) | NaBa2La2Fe2+Ti2[Si4O12]2O2(O,OH) · H2O |
| 9.CE.25 | Strontiojoaquinite | Sr2Ba2(Na,Fe)2Ti2[Si4O12]2O2(O,OH)2 · H2O |
| 9.CE.25 | Orthojoaquinite-(Ce) | NaBa2Ce2FeTi2[Si4O12]2O2(O,OH) · H2O |
| 9.CE.25 | Strontio-orthojoaquinite | (Na,Fe)2Sr2Ba2Ti2[Si4O12]2O2(O,OH)2 · H2O |
| 9.CE.30e | Labuntsovite-Mn | Na4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O |
| 9.CE.30b | Tsepinite-Na | Na2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O |
| 9.CE.30c | Gjerdingenite-Na | K2Na(Nb,Ti)4(Si4O12)2(OH,O)4 · 5H2O |
| 9.CE.30h | Alsakharovite-Zn | NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O |
| 9.CE.30c | Burovaite-Ca | (Na,K)4Ca2(Ti,Nb)8(Si4O12)4(OH,O)8 · 12H2O |
| 9.CE.30a | Nenadkevichite | (Na,◻)8Nb4(Si4O12)2(O,OH)4 · 8H2O |
| 9.CE.30b | Tsepinite-Sr | Sr(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O |
| 9.CE.30c | Gjerdingenite-Mn | K2Mn2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O |
| 9.CE.30b | Paratsepinite-Na | (Na,Sr,K,Ca)7(Ti,Nb)8(Si4O12)4(O,OH)8 · nH2O n ~ 8 |
| 9.CE.30d | Lemmleinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O |
| 9.CE.30c | Karupmøllerite-Ca | (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 7H2O |
| 9.CE.30c | Lepkhenelmite-Zn | (Ba,K)2Zn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O |
| 9.CE.30h | Gutkovaite-Mn | K2CaMn(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O |
| 9.CE.30e | Labuntsovite-Mg | Na4K4(Ba,K)2Mg(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2O |
| 9.CE.30e | Labuntsovite-Fe | Na4K4(Ba,K)2Fe2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2O |
| 9.CE.30c | Kuzmenkoite-Zn | K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4 · 6-8H2O |
| 9.CE.30f | Paralabuntsovite-Mg | Na8K8Mg4Ti16(Si4O12)8(OH,O)16 · 20-24H2O |
| 9.CE.30d | Lemmleinite-Ba | Na2K2Ba(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O |
| 9.CE.30g | Organovaite-Mn | K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4 · 5-7H2O |
| 9.CE.30g | Organovaite-Zn | K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O |
| 9.CE.30c | Gjerdingenite-Fe | K2Fe2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O |
| 9.CE.30a | Unnamed (Ca-Na-ordered analogue of Korobitsynite) | (Ca,Na)2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2O |
| 9.CE.30g | Parakuzmenkoite-Fe | (K,Ba)4Fe(Ti,Nb)8(Si4O12)4(O,OH)8 · 14H2O |
| 9.CE.30a | Korobitsynite | (Na,◻)4Ti2(Si4O12)(O,OH)2 · 4H2O |
| 9.CE.30c | Kuzmenkoite-Mn | K2Mn2+(Ti,Nb)4(Si4O12)2(OH,O)4 · 5-6H2O |
| 9.CE.30b | Tsepinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O |
| 9.CE.30b | Paratsepinite-Ba | Ba4(Ti,Nb)8(Si4O12)4(OH,O)8 · 8H2O |
| 9.CE.30h | Neskevaaraite-Fe | K3Na2Fe2+(Ti,Nb)4(Si4O12)2(O,OH)4 · 5-6 H2O |
| 9.CE.30c | Gjerdingenite-Ca | K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O |
| 9.CE.30b | Tsepinite-Ca | (Ca,K,Na)2-x(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O |
| 9.CE.45 | Natrokomarovite | (Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2O |
| 9.CE.45 | Komarovite | (Ca,Mn)(Nb,Ti)2[Si2O7](O,F)3 · 3.5H2O |
Radioactivity
Radioactivity:
| Element | % Content | Activity (Bq/kg) | Radiation Type |
|---|---|---|---|
| Uranium (U) | 0.0000% | 0 | α, β, γ |
| Thorium (Th) | 0.0000% | 0 | α, β, γ |
| Potassium (K) | 11.6294% | 3,605 | β, γ |
For comparison:
- Banana: ~15 Bq per fruit
- Granite: 1,000–3,000 Bq/kg
- EU exemption limit: 10,000 Bq/kg
Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.
Interactive Simulator:
Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!
Activity: –
| Distance | Dose rate | Risk |
|---|---|---|
| 1 cm | ||
| 10 cm | ||
| 1 m |
The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).
D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield
Fluorescence of Vuoriyarvite-K
Not fluorescent.
Other Information
IR Spectrum:
The strongest IR absorption bands are at 468, 690, 938, 1090, 1135, 1645, and 3400 cm-1.
Notes:
Insoluble in dilute HCl and H2SO4.
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 Vuoriyarvite-K
mindat.org URL:
https://www.mindat.org/min-7359.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Vuoriyarvite-K
Reference List:
Jambor, John L., Grew, Edward S., Roberts, Andrew C. (1998) New mineral names. American Mineralogist, 83 (11) 1347-1352
Localities for Vuoriyarvite-K
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Greenland | |
| Petersen et al. (1996) +1 other reference |
Namibia | |
| Irene M. Abraham (2009) |
Russia | |
| Pekov et al. (2005) |
| Arzamastsev et al. (2008) | |
| Arzamastsev et al. (2008) | |
| Specimen from Dr. Igor Pekov | |
| Pekov et al. (2004) +1 other reference | |
| Pekov (2003) |
| American Mineralogist | |
| Chukanov et al. (2001) +1 other reference |
| SUBBOTIN et al. (1998) +1 other reference |
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Kaskasnyunchorr Mountain, Khibiny Massif, Murmansk Oblast, Russia