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Kosmochlor

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Formula:
NaCrSi2O6
System:
Monoclinic
Colour:
emerald green
Hardness:
6

Classification of Kosmochlor

Approved
8/F.01-170
9.DA.25

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
65.1.3c.4

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
14.15.1

14 : Silicates not Containing Aluminum
15 : Silicates of Cr
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First Recorded Occurrence of Kosmochlor

Year of Discovery:
1897

Physical Properties of Kosmochlor

Colour:
emerald green
Streak:
pale green
Hardness (Mohs):
6
Cleavage:
Distinct/Good

Crystallography of Kosmochlor

Crystal System:
Monoclinic
Cell Parameters:
a = 9.57Å, b = 8.71Å, c = 5.26Å
β = 107.49°
Ratio:
a:b:c = 1.099 : 1 : 0.604
Unit Cell Volume:
V 418.18 ų (Calculated from Unit Cell)

Optical Data of Kosmochlor

Type:
Biaxial
RI values:
nα = 1.766 nγ = 1.781
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong

Chemical Properties of Kosmochlor

Formula:
NaCrSi2O6
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Fe,Mn,Mg,Ca,K,P

Relationship of Kosmochlor to other Species

Series:
Forms a series with Diopside (see here)
Other Members of Group:
AegirineNaFe3+Si2O6
Aegirine-augite(Na,Ca)(Fe3+,Fe2+,Mg,Al)Si2O6
Augite(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
ClinoenstatiteMgSiO3
ClinoferrosiliteFe2+SiO3
DiopsideCaMgSi2O6
EsseneiteCaFe3+[AlSiO6]
GrossmaniteCaTi3+ AlSiO6
HedenbergiteCaFe2+Si2O6
JadeiteNa(Al,Fe3+)Si2O6
Jervisite(Na,Ca,Fe2+)(Sc,Mg,Fe2+)Si2O6
JohannseniteCaMn2+Si2O6
KanoiteMn2+(Mg,Mn2+)Si2O6
KushiroiteCaAl[AlSiO6]
NamansiliteNaMn3+Si2O6
NatalyiteNa(V3+,Cr)Si2O6
Omphacite(Ca,Na)(Mg,Al)Si2O6
PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6
Pigeonite(Mg,Fe2+,Ca)(Mg,Fe2+)Si2O6
SpodumeneLiAlSi2O6
9.DA.05Donpeacorite(Mn2+,Mg)Mg[SiO3]2
9.DA.05EnstatiteMgSiO3
9.DA.05FerrosiliteFeSiO3
9.DA.10ClinoenstatiteMgSiO3
9.DA.10ClinoferrosiliteFe2+SiO3
9.DA.10KanoiteMn2+(Mg,Mn2+)Si2O6
9.DA.10Pigeonite(Mg,Fe2+,Ca)(Mg,Fe2+)Si2O6
9.DA.15Augite(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
9.DA.15DiopsideCaMgSi2O6
9.DA.15EsseneiteCaFe3+[AlSiO6]
9.DA.15HedenbergiteCaFe2+Si2O6
9.DA.15JohannseniteCaMn2+Si2O6
9.DA.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6
9.DA.15DavisiteCaScAlSiO6
9.DA.15KushiroiteCaAl[AlSiO6]
9.DA.15GrossmaniteCaTi3+ AlSiO6
9.DA.20Aegirine-augite(Na,Ca)(Fe3+,Fe2+,Mg,Al)Si2O6
9.DA.20Omphacite(Ca,Na)(Mg,Al)Si2O6
9.DA.25AegirineNaFe3+Si2O6
9.DA.25JadeiteNa(Al,Fe3+)Si2O6
9.DA.25Jervisite(Na,Ca,Fe2+)(Sc,Mg,Fe2+)Si2O6
9.DA.25NamansiliteNaMn3+Si2O6
9.DA.25NatalyiteNa(V3+,Cr)Si2O6
9.DA.30SpodumeneLiAlSi2O6
14.15.2NatalyiteNa(V3+,Cr)Si2O6
14.15.3KnorringiteMg3Cr2(SiO4)3
14.15.4KrinoviteNa2Mg4Cr23+(Si6O18)O2
14.15.5UvaroviteCa3Cr2(SiO4)3

Other Names for Kosmochlor

Name in Other Languages:

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.

References for Kosmochlor

Reference List:
American Mineralogist (1965): 50: 2096.

American Mineralogist (1968): 53: 511.

Clark, J.R., D.E. Appleman, and J.J. Papike (1969) Crystal-chemical characterization of clinopyroxenes based on eight new structure refinements. MSA Special Paper 2: 31-50.

Cameron, M., S. Shigeho, C.T. Prewitt & J.J. Papike (1973), High temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene and ureyite: American Mineralogist: 58: 594-618.

Mineralogical Magazine (1988): 52: 535.

Origlieri, M.J., Downs, R.T., Thompson, R.M., Pommier, C.J.S., Denton, M.B., and harlow, G.E. (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6 and systematics of anisotropic compression in pyroxenes. American Mineralogist: 88: 1025-1032.

Internet Links for Kosmochlor

Localities for Kosmochlor

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Azerbaijan
 
  • Naxçıvan District (Naxcivan; Nakhichevan)
    • Shusha
Lee M R, Russell S S, Arden J W, Pillinger C T (1995) Nierite (Si3N4), a new mineral from ordinary and enstatite chondrites, Meteoritics, 30, 387-398
Burma (Myanmar)
 
  • Kachin State
    • Mohnyin District (Moe Hnyin District)
      • Hpakant Township (Hpakan; Phakant; Phakan)
Shi, G. H., Zhu, X. K., Deng, J., Mao, Q., Liu, Y. X., & Li, G. W. (2011). Geochimica et Cosmochimica Acta, 75(6), 1608-1620; Shi, G., Harlow, G.E., Wang, J. Wang, J., Ng, E., Wang, X., Cao, G. & Cui, W. (2012): Mineralogy of jadeitite and related rocks from Myanmar:a review with new data. Eur. J. Mineral. 24, 345–370
American Mineralogist, Volume 69, pages 1180-1i,83' 1984
France
 
  • Midi-Pyrénées
    • Tarn-et-Garonne
      • Orgueil
A. Greshake & Adolf Bischoff (1996). Chromium-bearing Phases in Orgueil (CI): Discovery of Magnesiochromite (MgCr2O4), Ureyite (NaCrSi2O6), and Chromium Oxide (Cr2O3). Lunar and Planetary Science, 27, p. 461.
Italy
 
  • Piedmont
    • Torino Province
      • Susa Valley
        • Condove
Fornaseri M., Bensa G. (1939): Sulla cloromelanitite di Mocchie in Val di Susa. Periodico di Mineralogia - Roma pp. 217-230.
Japan
 
  • Honshu Island
    • Chubu Region
      • Niigata Prefecture
wwwsoc.nii.ac.jp/jampeg/93-11.htm.
Fossa Magna Museum specimen, Itoigawa
    • Chugoku region
      • Okayama prefecture
        • Niimi City
Sakamoto & Takasu (1996) Chishitsugaku Zasshi, 102, 49-52.
Mexico
 
  • Coahuila
    • Bolsom de Mapimí
Phil. Trans. R. Soc. Lond A. 286, 453-491 (1977)
  • Mexico
    • Jiquipilco (Xiquipilco)
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Laspeyres, H. 1897 Die steinigen Gemengtheile im Meteoreisen von Toluca in Mexico. Z. Kristallogr. Kristallgeom. 27, 586-600.
Poland
 
  • Wielkopolskie
    • Poznan
MULTIMINERAL INCLUSIONS IN THE MORASKO COARSE OCTAHEDRITE www.lpi.usra.edu/meetings/metsoc2008/pdf/5232.pdf
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • White Sea Coast
Zapiski Vserossijskogo Mineralogicheskogo Obshchestva 132, issue 3, 101-108
South Africa
 
  • Western Cape Province
    • Cape Winelands District
Phil. Trans. R. Soc. Lond A. 286, 453-491 (1977)
USA
 
  • Arizona
    • Coconino Co.
      • Winslow
        • Meteor Crater and vicinity
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 171-172, 269, 354; Olsen, E. & L. Fuchs (1968), Krinovite, NaMg2CrSi3O10 = a new meteorite mineral, Science 161: 786-787.; Space Science Reviews, Volume 14, Issue 6, pp.758-831
  • Kansas
    • McPherson Co.
Lee M R, Russell S S, Arden J W, Pillinger C T (1995) Nierite (Si3N4), a new mineral from ordinary and enstatite chondrites, Meteoritics, 30, 387-398
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