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Kosmochlor

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Tawmaw (Tawhmaw; Taw Maw), Hpakant-Tawmaw Jade Tract, Hpakant Township (Hpakan; Phakant; Phakan), Mohnyin District (Moe Hnyin District), Kachin State, Burma (Myanmar)
© Pavel M. Kartashov

Show Kosmochlor Photos (5)



Formula:
NaCrSi
 
2
O
 
6
System:MonoclinicColour:emerald green
Hardness:6
Member of:Clinopyroxene Subgroup > Pyroxene Group


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:
NaCrSi
 
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:Clinopyroxene Subgroup > Pyroxene Group
Other Members of Group:

- +
Aegirine
NaFe
3+
 
Si
 
2
O
 
6
Augite
(Ca,Na)(Mg,Fe
2+
 
,Al,Fe
3+
 
,Ti)[(Si,Al)
 
2
O
 
6
]
Clinoenstatite
MgSiO
 
3
Clinoferrosilite
Fe
2+
 
SiO
 
3
Diopside
CaMgSi
 
2
O
 
6
Esseneite
CaFe
3+
 
[AlSiO
 
6
]
Grossmanite
CaTi
3+
 
 AlSiO
 
6
Hedenbergite
CaFe
2+
 
Si
 
2
O
 
6
Jadeite
Na(Al,Fe
3+
 
)Si
 
2
O
 
6
Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)Si
 
2
O
 
6
Johannsenite
CaMn
2+
 
Si
 
2
O
 
6
Kanoite
Mn
2+
 
(Mg,Mn
2+
 
)Si
 
2
O
 
6
Kushiroite
CaAl[AlSiO
 
6
]
Namansilite
NaMn
3+
 
Si
 
2
O
 
6
Natalyite
Na(V
3+
 
,Cr)Si
 
2
O
 
6
Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)Si
 
2
O
 
6
Pigeonite
(Mg,Fe
2+
 
,Ca)(Mg,Fe
2+
 
)Si
 
2
O
 
6
Spodumene
LiAlSi
 
2
O
 
6
Related Minerals - Nickel-Strunz Grouping):

- +
9.DA.05Donpeacorite
(Mn
2+
 
,Mg)Mg[SiO
 
3
]
 
2
9.DA.05Enstatite
MgSiO
 
3
9.DA.05Ferrosilite
FeSiO
 
3
9.DA.10Clinoenstatite
MgSiO
 
3
9.DA.10Clinoferrosilite
Fe
2+
 
SiO
 
3
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
CaMgSi
 
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
LiAlSi
 
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
(Si
 
6
O
 
18
)O
 
2
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

    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.
    Hide Locality List
    (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
      • Mohnyin District (Moe Hnyin District)
        • Hpakant Township (Hpakan; Phakant; Phakan)
          • Hpakant-Tawmaw Jade Tract
    		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
          • 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
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