Kosmochlor Mineral Data

Kosmochlor Mineral Data +

General Kosmochlor Information

Chemical Formula:

NaCr+++Si2O6

Composition:

Molecular Weight = 227.15 gm

Sodium 10.12 % Na 13.64 % Na₂O

Chromium 22.89 % Cr 33.46 % Cr₂O₃

Silicon 24.73 % Si 52.90 % SiO₂

Oxygen 42.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCrSi₂O₆

IMA Status:

Valid Species (Pre-IMA) 1894

Locality:

Link to MinDat.org Location Data.

Synonym:

Cosmochlore

ICSD 9670

PDF 26-1484

Ureyite

Kosmochlor Image

Images:

Kosmochlor

Comments: Green resinous massive kosmochlor, variety ureyite, in serpentinite.
Location: Myanmar. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Kosmochlor Crystallography

Axial Ratios:

a:b:c =1.0989:1:0.6043

Cell Dimensions:

a = 9.574, b = 8.712, c = 5.265, Z = 4; beta = 107.49° V = 418.84 Den(Calc)= 3.60

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.958(1), 2.87(0.65), 2.511(0.4),

Crystal Structure:

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Cameron M , Sueno S , Prewitt C T , Papike J J , American Mineralogist , 58 (1973) p.594-618, High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite,, spodumene, and ureyite, T = 24 C, pyroxene

View Additional jPOWD Structure files for Kosmochlor
[1] [10] [11] [12] [13] [14] [15] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Kosmochlor

Cleavage:

[110] Good

Color:

Emerald green.

Density:

3.6

Diaphaniety:

Transparent to Translucent

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Kosmochlor

Gladstone-Dale:

CI meas= 0.078 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2149,KPDmeas= 0.2149,KC= 0.233

Optical Data:

Biaxial (?), a=1.766, g=1.781, bire=0.0150

Calculated Properties of Kosmochlor

Electron Density:

r_electron=3.52 gm/cc
note: r_Kosmochlor=3.60 gm/cc.

Fermion Index

Fermion Index = 0.03349
Boson Index = 0.96651

Photoelectric:

PE_Kosmochlor= 6.21 barns/electron
U=PE_Kosmochlor x r_electron= 21.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kosmochlor is Not Radioactive

Kosmochlor Classification

Dana Class:

65.1.3c.4 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.3c)C2/c clinopyroxenes (Na clinopyroxenes)

65.1.3c.1 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

65.1.3c.2 Aegirine NaFeSi2O6 C 2/c 2/m

65.1.3c.3 Namansilite NaMn(Si2O6) C 2/c 2/m

65.1.3c.4 Kosmochlor NaCrSi2O6 C 2/c 2/m

65.1.3c.5 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

65.1.3c.6 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

Strunz Class:

VIII/F.01-170 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-

VIII/F.01 - Pyroxene group, Clinopyroxene

VIII/F.01-10 Clinoenstatite Mg2Si2O6 P 2₁/c 2/m

VIII/F.01-20 Clinoferrosilite (Fe,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-30 Kanoite (Mn,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-40 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 2₁/c 2/m

VIII/F.01-50 Diopside CaMgSi2O6 C 2/c 2/m

VIII/F.01-60 Hedenbergite CaFeSi2O6 C 2/c 2/m

VIII/F.01-70 Johannsenite CaMnSi2O6 C 2/c 2/m

VIII/F.01-80 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

VIII/F.01-90 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

VIII/F.01-100 Omphacite (Ca,Na)(Mg,Fe,Al)Si2O6 P 2/n 2/m

VIII/F.01-110 Esseneite CaFeAlSiO6 C 2/c 2/m

VIII/F.01-120 Spodumene LiAlSi2O6 C 2/c 2/m

VIII/F.01-130 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

VIII/F.01-140 Aegirine NaFeSi2O6 C 2/c 2/m

VIII/F.01-145 Namansilite NaMn(Si2O6) C 2/c 2/m

VIII/F.01-150 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

VIII/F.01-160 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

VIII/F.01-170 Kosmochlor NaCrSi2O6 C 2/c 2/m

Other Kosmochlor Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Kosmochlor

NaCr+++Si2O6
Dana No: 65.1.3c.4 Strunz No: VIII/F.01-170
Locality:

Notes: