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Koashvite Mineral Data

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General Koashvite Information

Help on Chemical  Formula: Chemical Formula: Na6(Ca,Mn)(Ti,Fe)Si6O18•(H2O)
Help on Composition: Composition: Molecular Weight = 711.83 gm
   Sodium     19.38 %  Na   26.12 % Na2O
   Calcium     2.82 %  Ca    3.94 % CaO
   Titanium    3.36 %  Ti    5.61 % TiO2
   Manganese   3.86 %  Mn    4.98 % MnO
   Iron        3.92 %  Fe    5.61 % Fe2O3
   Silicon    23.67 %  Si   50.65 % SiO2
   Hydrogen    0.28 %  H     2.53 % H2O
   Oxygen     42.71 %  O
             ______        ______ 
             100.00 %       99.44 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na6Ca0.5Mn2+0.5Ti0.5Fe3+0.5Si6O18•(H2O)
Help on Environment: Environment: In alkalic pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: Mt. Koashva, Khibiny massif, Kola, Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Koashvite + Pronunciation Say KOASHVITE
Help on Synonym: Synonym: ICSD 86517
  PDF 27-669

Koashvite Image

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Comments: Brown translucent crystalline fragment of koashvite.
Location: Mount Koashva, Khibiny Massive, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Koashvite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3511:1:0.4865
Help on Cell Dimensions: Cell Dimensions: a = 7.356, b = 20.95, c = 10.194, Z = 4; V = 1,570.98 Den(Calc)= 3.01
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmnb
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.581(1), 1.82(0.7), 3.66(0.5),

Physical Properties of Koashvite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish yellow, Light yellow.
Help on Density: Density: 2.98 - 3.02, Average = 3
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Koashvite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2135,KPDmeas= 0.2142,KC= 0.2214
Ncalc = 1.66 - 1.67
Help on Optical Data: Optical Data: Biaxial (-), a=1.637, b=1.643, g=1.648, bire=0.0110, 2V(Calc)=84, 2V(Meas)=82-84. Dispersion weak, r > v.

Calculated Properties of Koashvite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.95 gm/cc
note: Specific Gravity of Koashvite =3.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEKoashvite = 4.25 barns/electron
U=PEKoashvite x rElectron Density= 12.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Koashvite is Not Radioactive

Koashvite Classification

Help on  Dana Class: Dana Class: 61.01.02b.02 (61)Cyclosilicate Six-Membered Rings
  (61.01)with [Si6O18] rings; possible (OH) and Al substitution
  (61.01.02b)Lovozerite group (Ortho and MON subgroup)
61.01.02b.01 Imandrite Na12Ca3Fe2Si12O36 Pnnm 2/m 2/m 2/m
61.01.02b.02 Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18•(H2O) Pmnb 2/m 2/m 2/m
61.01.02b.03 Petarasite Na5Zr2Si6O18(Cl,OH)•2(H2O) P 21/m 2/m
61.01.02b.04 Litvinskite! Na2([],Na,Mn)Zr[Si6O12(OH,O)6] Cm m
Help on  Strunz Class: Strunz Class: 09.CJ.20 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe),
09.CJ.20 Koashvite Na6(Ca,Mn)(Ti,Fe)Si6O18•(H2O) Pmnb 2/m 2/m 2/m
09.CJ.20 Imandrite Na12Ca3Fe2Si12O36 Pnnm 2/m 2/m 2/m

Other Koashvite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Koashvite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: 61.01.02b.02 Strunz No: 09.CJ.20





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