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Kosmochlor

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Tawmaw (Tawhmaw; Taw Maw), Myitkyina-Mogaung District, Kachin State, Burma (Myanmar)
© Knut Eldjarn

Show Kosmochlor Photos (3)
Formula:
NaCr[Si
 
2
O
 
6
]
System:MonoclinicColour:emerald green
Hardness:6


Pyroxene Group - Clinopyroxene Subgroup.

Classification of Kosmochlor

IMA status:Approved
Strunz 8th edition ID:8/F.01-170
Nickel-Strunz 10th (pending) edition ID:9.DA.25

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
Dana 8th edition ID:65.1.3c.4

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:14.15.1

14 : Silicates not Containing Aluminum
15 : Silicates of Cr
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Type Occurrence of Kosmochlor

Type Locality:Toluca meteorite, Jiquipilco (Xiquipilco), Mexico, Mexico
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
Maximum Birefringence:δ = 0.015

Chart 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:
NaCr[Si
 
2
O
 
6
]
Essential elements:Cr, Na, O, Si
All elements listed in formula:Cr, Na, O, Si
Common Impurities:Ti,Al,Fe,Mn,Mg,Ca,K,P

Relationship of Kosmochlor to other Species

Member of Group:
Clinopyroxene Subgroup:
Related Minerals - Nickel-Strunz Grouping):

- +
9.DA.05Donpeacorite
(Mn
2+
 
,Mg)Mg[SiO
 
3
]
 
2
9.DA.05Enstatite
Mg
 
2
[SiO
 
3
]
 
2
9.DA.05Ferrosilite
Fe
 
2
[SiO
 
3
]
 
2
9.DA.10Clinoenstatite
Mg
 
2
[Si
 
2
O
 
6
]
9.DA.10Clinoferrosilite
Fe
2+
 
(Fe
2+
 
,Mg)[Si
 
2
O
 
6
]
9.DA.10Kanoite
Mn
2+
 
(Mg,Mn
2+
 
)[Si
 
2
O
 
6
]
9.DA.10Pigeonite
(Mg,Fe
2+
 
,Ca)(Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.15Augite
(Ca,Na)(Mg,Fe
2+
 
,Al,Fe
3+
 
,Ti)[(Si,Al)
 
2
O
 
6
]
9.DA.15Diopside
CaMg[Si
 
2
O
 
6
]
9.DA.15Esseneite
CaFe
3+
 
[AlSiO
 
6
]
9.DA.15Hedenbergite
CaFe
2+
 
[Si
 
2
O
 
6
]
9.DA.15Johannsenite
CaMn
2+
 
[Si
 
2
O
 
6
]
9.DA.15Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.15Davisite
CaScAlSiO
 
6
9.DA.15Kushiroite
CaAl[AlSiO
 
6
]
9.DA.15Grossmanite
CaTi
3+
 
 AlSiO
 
6
9.DA.20Aegirine-augite
(Na,Ca)(Fe
3+
 
,Fe
2+
 
,Mg,Al)Si
 
2
O
 
6
9.DA.20Omphacite
(Ca,Na)(Mg,Al)[Si
 
2
O
 
6
]
9.DA.25Aegirine
NaFe
3+
 
[Si
 
2
O
 
6
]
9.DA.25Jadeite
Na(Al,Fe
3+
 
)[Si
 
2
O
 
6
]
9.DA.25Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.25Namansilite
NaMn
3+
 
[Si
 
2
O
 
6
]
9.DA.25Natalyite
Na(V
3+
 
,Cr)[Si
 
2
O
 
6
]
9.DA.30Spodumene
LiAl[Si
 
2
O
 
6
]
Related Minerals - Hey's Index Grouping:

- +
14.15.2Natalyite
Na(V
3+
 
,Cr)[Si
 
2
O
 
6
]
14.15.3Knorringite
Mg
 
3
Cr
 
2
[SiO
 
4
]
 
3
14.15.4Krinovite
Na
 
2
Mg
 
4
Cr
3+
2
[O
 
2
|Si
 
6
O
 
18
]
14.15.5Uvarovite
Ca
 
3
Cr
 
2
[SiO
 
4
]
 
3

Other Names for Kosmochlor

Synonyms:
Chrome-AcmiteCosmochloreIMA1965-007Ureyite
Other Languages:
Italian:Cloromelanitite
Russian:Космохлор

Other Information

Health Warning: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

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    Localities for Kosmochlor

    Hide Locality List
    The 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. ? 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.
    Burma (Myanmar)
     
    • Kachin State
      • Myitkyina-Mogaung District
    		American Mineralogist, Volume 69, pages 1180-1i,83' 1984
    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
          • Ohsa-cho
    		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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • White Sea Coast
    		Zapiski Vserossijskogo Mineralogicheskogo Obshchestva 132, issue 3, 101-108
    South Africa
     
    • Western Cape Province
    		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
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 24th Oct 2009 15:32:13