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

Environment:

A major constituent of some jadeitites; an accessory constituent of some iron meteorites.

IMA Status:

Valid Species (Pre-IMA) 1894

Locality:

In the Toluca, Coahuila, Hex River Mountains, and Canyon Diablo meteorites. Link to MinDat.org Location Data.

Name Origin:

From the German kosmisch, for cosmic, in allusion to its meteoritic occurrence, and the Greek chlor, for green.

Name Pronunciation:

Kosmochlor + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.84

Optical Data:

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

Calculated Properties of Kosmochlor

Electron Density:

Bulk Density (Electron Density)=3.52 gm/cc
note: Specific Gravity of Kosmochlor =3.60 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Kosmochlor= 6.21 barns/electron
U=PE_Kosmochlor x rElectron Density= 21.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kosmochlor is Not Radioactive

Kosmochlor Classification

Dana Class:

65.01.03c.04 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.01)with chains P=2

(65.01.03c)C2/c clinopyroxenes (Na clinopyroxenes)

65.01.03c.01 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

65.01.03c.02 Aegirine NaFeSi2O6 C 2/c 2/m

65.01.03c.03 Namansilite NaMn(Si2O6) C 2/c 2/m

65.01.03c.04 Kosmochlor NaCrSi2O6 C 2/c 2/m

65.01.03c.05 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

65.01.03c.06 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

Strunz Class:

09.DA.25 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family

09.DA.25 Aegirine NaFeSi2O6 C 2/c 2/m

09.DA.25 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

09.DA.25 Kosmochlor NaCrSi2O6 C 2/c 2/m

09.DA.25 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

09.DA.25 Namansilite NaMn(Si2O6) C 2/c 2/m

09.DA.25 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

Other Kosmochlor Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Kosmochlor :
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
15 - WWW-MINCRYST

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Ask about Kosmochlor here :
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Print or Cut-and-Paste your Kosmochlor Specimen Label here :

Kosmochlor

NaCr+++Si2O6
Dana No: 65.01.03c.04 Strunz No: 09.DA.25
Locality:

Notes: