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Kosmochlor

A valid IMA mineral species - grandfathered
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About KosmochlorHide

Formula:
NaCrSi2O6
Colour:
Emerald-green, dark green
Hardness:
6
Specific Gravity:
3.51 - 3.60
Crystal System:
Monoclinic
Name:
Named for the Greek words for space and the color green. Found as a residue after dissolution of the Toluca iron meterorite.
Pyroxene Group - Clinopyroxene Subgroup.
Jadeite-Kosmochlor Series.

A rare, bright green pyroxene, found in some jade deposits and meteorites.
Also a colouring component of the decorative rock Maw Sit Sit.

Compare UM2003-36-SiO:CaNa.





Unique IdentifiersHide

Mindat ID:
2258
Long-form identifier:
mindat:1:1:2258:9
GUID
(UUID V4):
630c981d-90a7-46b2-8c7f-25455449fb6c

IMA Classification of KosmochlorHide

Classification of KosmochlorHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
KosIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
KosWhitney & Evans (2010)Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371

Physical Properties of KosmochlorHide

Transparency:
Translucent
Colour:
Emerald-green, dark green
Streak:
pale green
Hardness:
Cleavage:
Distinct/Good
Good on {110}
Parting:
parting on {001}
Density:
3.51 - 3.60 g/cm3 (Measured)    3.60 g/cm3 (Calculated)

Optical Data of KosmochlorHide

Type:
Biaxial (-)
RI values:
nα = 1.740 - 1.766 nβ = 1.756 - 1.778 nγ = 1.745 - 1.781
2V:
Measured: 6° to 70°
Max Birefringence:
δ = 0.005 - 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
strong
Pleochroism:
Strong
Comments:
X = yellowish green; Y = blue-green, grass-green; Z = emerald-green.

Chemistry of KosmochlorHide

Mindat Formula:
NaCrSi2O6
Common Impurities:
Ti,Al,Fe,Mn,Mg,Ca,K,P

Crystallography of KosmochlorHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 9.550 Å, b = 8.712 Å, c = 5.273 Å
β = 107.44°
Ratio:
a:b:c = 1.096 : 1 : 0.605
Unit Cell V:
418.54 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Simple, lamellar on {100}, {001}.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000359KosmochlorCameron M, Sueno S, Prewitt C T, Papike J J (1973) High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite pyroxene American Mineralogist 58 594-61819730297
0000360KosmochlorCameron M, Sueno S, Prewitt C T, Papike J J (1973) High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite pyroxene American Mineralogist 58 594-61819730673
0000361KosmochlorCameron M, Sueno S, Prewitt C T, Papike J J (1973) High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite pyroxene American Mineralogist 58 594-61819730873
0002806KosmochlorSecco L, Martignago F, Dal Negro A, Reznitskii L Z, Sklyarov E V (2002) Crystal chemistry of Cr-V-rich clinopyroxenes Sample 1 American Mineralogist 87 709-71420020293
0003133KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220030.0001293
0003134KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220031.14293
0003135KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220032.22293
0003136KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220033.53293
0003137KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220035.05293
0003138KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220035.78293
0003139KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220036.25293
0003140KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220037.08293
0003141KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220037.23293
0003142KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220037.39293
0003143KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220038.5293
0003144KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220038.97293
0003145KosmochlorOriglieri M J, Downs R T, Thompson R M, Pommier C J S, Denton M B, Harlow G E (2003) High-pressure crystal structure of kosmochlor, NaCrSi2O6, and systematics of anisotropic compression in pyroxenes American Mineralogist 88 1025-103220039.28293
0020188KosmochlorPosner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-7072014synthetic2.1293
0020189KosmochlorPosner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-7072014synthetic18.5293
0020190KosmochlorPosner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-7072014synthetic31.3293
0020191KosmochlorPosner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-7072014synthetic35.3293
0020192KosmochlorPosner E S, Dera P, Downs R T, Lazarz J D, Irmen P (2014) High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor Physics and Chemistry of Minerals 41 695-7072014synthetic40.2293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.956 Å(100)
2.867 Å(100)
2.5166 Å(90)
2.4476 Å(70)
2.0985 Å(70)
1.5957 Å(70)
1.3802 Å(60)
Comments:
Synthetic

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration4.566-4.550
5 : Primary asteroid phases4.566–4.560

Type Occurrence of KosmochlorHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 81869, 81870; The Natural History Museum, London, England, 81869{81870.
Geological Setting of Type Material:
e jadeitites
Associated Minerals at Type Locality:
Reference:
Laspeyres, H. (1897) Die steinigen Gemengtheile im Meteoreisen von Toluca in Mexico. Zeitschrift für Krystallographie und Mineralogie: 27: 586–600.

Synonyms of KosmochlorHide

Other Language Names for KosmochlorHide

Relationship of Kosmochlor to other SpeciesHide

Other Members of this group:
AegirineNaFe3+Si2O6Mon. 2/m : B2/b
Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m : B2/b
Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : B2/b
BurnettiteCaVAlSiO6Mon. 2/m : B2/b
ClinoenstatiteMgSiO3Mon. 2/m : P21/b
ClinoferrosiliteFe2+2Si2O6Mon. 2/m : P21/b
ColomeraiteNaTi3+Si2O6Mon. 2/m : B2/b
DavisiteCaScAlSiO6Mon. 2/m : B2/b
DiopsideCaMgSi2O6Mon. 2/m : B2/b
EsseneiteCaFe3+[AlSiO6]Mon. 2/m : B2/b
GrossmaniteCaTi3+ AlSiO6Mon. 2/m : B2/b
HedenbergiteCaFe2+Si2O6Mon. 2/m : B2/b
JadeiteNa(Al,Fe3+)Si2O6Mon. 2/m : B2/b
JervisiteNaSc3+Si2O6Mon. 2/m : B2/b
JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
KushiroiteCaAl[AlSiO6]Mon. 2/m : B2/b
NamansiliteNaMn3+Si2O6Mon. 2/m : B2/b
NatalyiteNaV3+Si2O6Mon. 2/m : B2/b
Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon. 2/m : B2/b
Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : P21/b
RyabchikoviteCuMgSi2O6Mon. 2/m : P21/b
SpodumeneLiAlSi2O6Mon. 2/m : B2/b
Tissintite(Ca,Na,◻)AlSi2O6Mon. 2/m : B2/b
UM2001-19-SiO:AlCaMgNa(Na,Mg,Ca)(Mg,Al)Si2O6Mon. 2/m : B2/b
UM2003-36-SiO:CaNaNaCrSi2O6 - CaMgSi2O6Mon. 2/m : B2/b
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Kosmochlor associated with ChromojadeiteNa(Al,Cr)Si2O6
4 photos of Kosmochlor associated with Maw Sit Sit
4 photos of Kosmochlor associated with JadeiteNa(Al,Fe3+)Si2O6
4 photos of Kosmochlor associated with AlbiteNa(AlSi3O8)
2 photos of Kosmochlor associated with Chromium-bearing Magnesio-arfvedsonite[Na][Na2][Mg4(Fe3+,Cr3+)]Si8O22(OH)2
1 photo of Kosmochlor associated with TinSn
1 photo of Kosmochlor associated with EckermanniteNaNa2(Mg4Al}Si8O22(OH)2

Related Minerals - Strunz-mindat GroupingHide

9.DA.ProtoenstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
9.DA.RyabchikoviteCuMgSi2O6Mon. 2/m : P21/b
9.DA.ColomeraiteNaTi3+Si2O6Mon. 2/m : B2/b
9.DA.05Donpeacorite(Mn,Mg)MgSi2O6Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05EnstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05FerrosiliteFe2+2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.10ClinoenstatiteMgSiO3Mon. 2/m : P21/b
9.DA.10ClinoferrosiliteFe2+2Si2O6Mon. 2/m : P21/b
9.DA.10KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
9.DA.10Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : P21/b
9.DA.15Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : B2/b
9.DA.15DiopsideCaMgSi2O6Mon. 2/m : B2/b
9.DA.15EsseneiteCaFe3+[AlSiO6]Mon. 2/m : B2/b
9.DA.15HedenbergiteCaFe2+Si2O6Mon. 2/m : B2/b
9.DA.15 vaJeffersoniteCa(Mn,Zn,Fe)Si2O6
9.DA.15JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
9.DA.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon. 2/m : B2/b
9.DA.15DavisiteCaScAlSiO6Mon. 2/m : B2/b
9.DA.15KushiroiteCaAl[AlSiO6]Mon. 2/m : B2/b
9.DA.15GrossmaniteCaTi3+ AlSiO6Mon. 2/m : B2/b
9.DA.20Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m : B2/b
9.DA.20Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
9.DA.25AegirineNaFe3+Si2O6Mon. 2/m : B2/b
9.DA.25JadeiteNa(Al,Fe3+)Si2O6Mon. 2/m : B2/b
9.DA.25JervisiteNaSc3+Si2O6Mon. 2/m : B2/b
9.DA.25NamansiliteNaMn3+Si2O6Mon. 2/m : B2/b
9.DA.25NatalyiteNaV3+Si2O6Mon. 2/m : B2/b
9.DA.25Tissintite(Ca,Na,◻)AlSi2O6Mon. 2/m : B2/b
9.DA.30SpodumeneLiAlSi2O6Mon. 2/m : B2/b
9.DA.35HiroseiteFeSiO3Orth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Kosmochlor in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

Internet Links for KosmochlorHide

References for KosmochlorHide

Reference List:

Localities for KosmochlorHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Azerbaijan
 
  • Aghjabadi District
    • Hindarx
Lee M R et al. (1995)
France
 
  • Occitanie
    • Tarn-et-Garonne
      • Montauban
        • Orgueil
A. Greshake & Adolf Bischoff (1996)
Germany
 
  • Rhineland-Palatinate
    • Vulkaneifel
      • Gerolstein
        • Hohenfels-Essingen
Collection of Bernd Ternes.
India
 
  • Tamil Nadu
    • Krishnagiri District
Krátký et al. (2018)
Italy
 
  • Piedmont
    • Metropolitan City of Turin
      • Condove
Fornaseri M. (1939)
Japan
 
  • Niigata Prefecture
wwwsoc.nii.ac.jp/jampeg/93-11.htm.
      • Ōmi
Fossa Magna Museum specimen
Suzuki Y and Ohki Y (2019) +2 other references
  • Okayama Prefecture
    • Niimi City
Sakamoto & Takasu (1996)
Mexico
 
  • Coahuila
    • Ocampo Municipality
Phil. Trans. R. Soc. Lond A. 286 (1977)
  • Mexico
    • Jiquipilco (Xiquipilco)
Laspeyres +1 other reference
  • Zacatecas
    • Vetagrande Municipality
Meteoritical Bulletin: MB 107 (2018)
Myanmar
 
  • Kachin State
    • Mohnyin District
      • Hpakant Township (Hpakan; Phakant; Phakan)
Shi et al. (2011) +1 other reference
American Mineralogist +1 other reference
New Zealand
 
  • Waikato Region
    • Waikato District
Ikehata et al. (2004)
Oman
 
  • Al Batinah North Governorate
Arai +4 other references
Poland
 
  • Greater Poland Voivodeship
    • Poznań
Karwowski et al. (2008)
Russia
 
  • Lake Baikal area
    • Slyudyanka
Bosi et al. (2014)
  • Murmansk Oblast
    • White Sea Coast
Zapiski Vserossijskogo ...
  • Sakha
    • Oymyakonsky District
Sharygin (2020)
South Africa
 
  • Western Cape
    • Cape Winelands District Municipality
      • Witzenberg Local Municipality
Phil. Trans. R. Soc. Lond A. 286 (1977)
USA
 
  • Arizona
    • Coconino County
      • Meteor Crater area
Space Science Reviews +2 other references
  • Kansas
    • McPherson County
Lee M R et al. (1995)
  • Utah
    • San Juan County
Schulze et al. (2014)
 
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