Koashvite
A valid IMA mineral species
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About Koashvite
Formula:
Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O
Colour:
Pale yellow
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
2.98 - 3.02
Crystal System:
Orthorhombic
Member of:
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.
Unique Identifiers
Mindat ID:
2230
Long-form identifier:
mindat:1:1:2230:5
GUID
(UUID V4):
(UUID V4):
07321192-2bfe-47c6-9e4f-ffda9bb7bd55
Classification of Koashvite
Approved
First published:
1974
Type description reference:
9.CJ.15c
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
61.1.2b.2
61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
14.9.38
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
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 |
---|---|---|
Koa | 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 Koashvite
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 Koashvite
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak
Chemical Properties of Koashvite
Formula:
Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O
IMA Formula:
Na6CaTiSi6O18
Common Impurities:
Mg,K
Crystallography of Koashvite
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 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 Koashvite
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:
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 Koashvite
Other Language Names for Koashvite
Relationship of Koashvite to other Species
Member of:
Related Minerals - Strunz-mindat Grouping
9.CJ. | Avdeevite | NaAl4(Be5Li)(Si6O18)2(H2O)1-2 | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
9.CJ. | Nakkaalaaqite | K2[Na3Ca]LiCa2Ti2Be4Si12O38 | Orth. mmm (2/m 2/m 2/m) : Fddd |
9.CJ. | Zolotarevite | Na5Zr[Si6O15(OH)3] · 3H2O | Trig. 3m (3 2/m) : R3m |
9.CJ. | Beryllocordierite-Na | NaMg4(Al5Be)(AlSi5O18)2 · 2H2O | Orth. mmm (2/m 2/m 2/m) : Cccm |
9.CJ. | Beryllosachanbińskiite-Na | NaMn4(Al5Be)(AlSi5O18)2 · 2H2O | Orth. mmm (2/m 2/m 2/m) : Cccm |
9.CJ.05 | Bazzite | Be3Sc2(Si6O18) | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CJ.05 | Beryl | Be3Al2(Si6O18) | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CJ.05 | Indialite | Mg2Al3(AlSi5O18) | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CJ.05 va | Vorobyevite | Be3Al2(Si6O18) | |
9.CJ.05 | Stoppaniite | Be3Fe3+2(Si6O18) · H2O | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CJ.05 | Ferroindialite | (Fe2+,Mg)2Al4Si5O18 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CJ.05 | Johnkoivulaite | Cs[Be2B]Mg2Si6O18 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc |
9.CJ.10 | Cordierite | (Mg,Fe)2Al3(AlSi5O18) | Orth. mmm (2/m 2/m 2/m) : Cccm |
9.CJ.10 | Sekaninaite | (Fe,Mg)2Al3(AlSi5O18) | Orth. mmm (2/m 2/m 2/m) : Cccm |
9.CJ.15a | Combeite | Na4.5Ca3.5Si6O17.5(OH)0.5 | Trig. 3m (3 2/m) : R3m |
9.CJ.15b | Imandrite | Na12Ca3Fe3+2(Si6O18)2 | Orth. mmm (2/m 2/m 2/m) |
9.CJ.15a | Kazakovite | Na6Mn2+Ti(Si6O18) | Trig. 3m (3 2/m) : R3m |
9.CJ.15a | Lovozerite | Na2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O | Trig. 3 : R3 |
9.CJ.15a | Tisinalite | Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O | Trig. 3m (3 2/m) |
9.CJ.15a | Zirsinalite | Na6(Ca,Mn2+,Fe2+)Zr(Si6O18) | Trig. 3m (3 2/m) : R3m |
9.CJ.15a | Litvinskite | Na2(◻,Na,Mn)ZrSi6O12(OH,O)6 | Mon. m : Bm |
9.CJ.15a | Kapustinite | Na6ZrSi6O16(OH)2 | Mon. 2/m : B2/m |
9.CJ.15a | Townendite | Na8ZrSi6O18 | Trig. 3m (3 2/m) : R3m |
9.CJ.25 | Baratovite | KCa7(Ti,Zr)2Li3Si12O36F2 | Mon. 2/m : B2/b |
9.CJ.25 | Katayamalite | KLi3Ca7Ti2(SiO3)12(OH)2 | Mon. 2/m : B2/b |
9.CJ.25 | Aleksandrovite | KCa7Sn2Li3Si12O36F2 | Mon. 2/m : B2/b |
9.CJ.30 | Dioptase | CuSiO3 · H2O | Trig. 3 : R3 |
9.CJ.35 | Kostylevite | K2Zr(Si3O9) · H2O | Mon. 2/m : P21/b |
9.CJ.40 | Petarasite | Na5Zr2(Si6O18)(Cl,OH) · 2H2O | Mon. 2/m : P21/m |
9.CJ.45 | Gerenite-(Y) | (Ca,Na)2(Y,REE)3Si6O18 · 2H2O | Tric. 1 : P1 |
9.CJ.50 | Odintsovite | K2Na4Ca3Ti2Be4Si12O38 | Orth. mmm (2/m 2/m 2/m) : Fddd |
9.CJ.55 | Mathewrogersite | Pb7FeAl3GeSi12O36(OH,H2O)6 | Trig. |
9.CJ.60 | Pezzottaite | Cs(Be2Li)Al2(Si6O18) | Trig. 3 : R3 |
Other Information
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 Koashvite
mindat.org URL:
https://www.mindat.org/min-2230.html
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References for Koashvite
Reference List:
Localities for Koashvite
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).
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.
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
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Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia