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Knorringite

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Oleg von Knorring
Formula:
Mg3Cr2(SiO4)3
Colour:
Green, blue
Lustre:
Vitreous
Hardness:
6 - 7
Crystal System:
Isometric
Name:
Named in 1968 by Peter H. Nixon and George Hornung in honor of Oleg Von Knorring [1915 Novgorod, Russia - 1994 Leeds, England, UK], a research geochemist at University of Helsinki, Finland and later Professor of Mineralogy, University of Leeds, England and associated with the Research Institute of African Geology. He specialized in granite pegmatite mineralogy and named: bertossaite, burangite, cerotungstite, holdawayite, karibibite, kennedyite, mboziite, mpororoite, namibite, rankamaite, waylandite, and westgrenite.
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Classification of KnorringiteHide

Approved
Approval Year:
1968
9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
51.4.3a.4

51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in [6] and >[6] coordination
14.15.3

14 : Silicates not Containing Aluminum
15 : Silicates of Cr

Physical Properties of KnorringiteHide

Vitreous
Colour:
Green, blue
Streak:
White
Hardness:
6 - 7 on Mohs scale

Optical Data of KnorringiteHide

Type:
Isotropic

Chemical Properties of KnorringiteHide

Formula:
Mg3Cr2(SiO4)3
Common Impurities:
Ti,Al,Fe,Mn,Ca

Crystallography of KnorringiteHide

Crystal System:
Isometric
Cell Parameters:
a = 11.59 Å
Unit Cell V:
1,556.86 ų (Calculated from Unit Cell)

Type Occurrence of KnorringiteHide

Synonyms of KnorringiteHide

Other Language Names for KnorringiteHide

German:Knorringit
Spanish:Knorringita

Relationship of Knorringite to other SpeciesHide

Other Members of this group:
AlmandineFe2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
AndraditeCa3Fe3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3Iso.
EringaiteCa3Sc2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
GoldmaniteCa3V3+2(SiO4)3Iso.
GrossularCa3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
MajoriteMg3(Fe2+,Si,Al)2(SiO4)3Iso.
Menzerite-(Y){(Y,REE),(Ca,Fe2+)}3{(Mg,Fe2+),(Fe3+,Al)}2[SiO4]3Iso. m3m (4/m 3 2/m) : Ia3d
Momoiite(Mn2+,Ca)3V3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3Iso.
PyropeMg3Al2(SiO4)3Iso.
SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
UvaroviteCa3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
Forms a series with:

Related Minerals - Nickel-Strunz GroupingHide

9.AD.AdrianiteCa12(Al4Mg3Si7)O32Cl6Iso. 4 3m : I4 3d
9.AD.05LarniteCa2SiO4Mon.
9.AD.10Calcio-olivineCa2SiO4Orth. mmm (2/m 2/m 2/m)
9.AD.15MerwiniteCa3Mg(SiO4)2Mon. 2/m : P21/b
9.AD.20BredigiteCa7Mg(SiO4)4Orth.
9.AD.25AndraditeCa3Fe3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25AlmandineFe2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3Iso.
9.AD.25GoldmaniteCa3V3+2(SiO4)3Iso.
9.AD.25GrossularCa3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AD.25HibschiteCa3Al2(SiO4)3-x(OH)4xIso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HydroandraditeCa3Fe3+2(SiO4)3-x(OH)4x
9.AD.25KatoiteCa3Al2(SiO4)3-x(OH)4x (x = 1.5-3)Iso.
9.AD.25KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3Iso.
9.AD.25MajoriteMg3(Fe2+,Si,Al)2(SiO4)3Iso.
9.AD.25MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3Iso.
9.AD.25PyropeMg3Al2(SiO4)3Iso.
9.AD.25SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3Iso.
9.AD.25SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25UvaroviteCa3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3Iso. 4 3m : I4 3d
9.AD.25HoltstamiteCa3(Al,Mn3+)2(SiO4)2(OH)4Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Momoiite(Mn2+,Ca)3V3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25EltyubyuiteCa12Fe3+10Si4O32Cl6Iso. 4 3m : I4 3d
9.AD.25HutcheoniteCa3Ti2(SiAl2)O12Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.30CoffiniteU(SiO4) · nH2OTet.
9.AD.30HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30ThoriteTh(SiO4)Tet.
9.AD.30ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30Stetindite-(Ce)Ce(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.35HuttoniteThSiO4Mon.
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2xMon.
9.AD.40EulytineBi4(SiO4)3Iso. 4 3m : I4 3d
9.AD.45ReiditeZrSiO4Tet. 4/m : I41/a

Related Minerals - Dana Grouping (8th Ed.)Hide

51.4.3a.1PyropeMg3Al2(SiO4)3Iso.
51.4.3a.2AlmandineFe2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
51.4.3a.3SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
51.4.3a.5MajoriteMg3(Fe2+,Si,Al)2(SiO4)3Iso.
51.4.3a.6Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3Iso.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.15.1KosmochlorNaCrSi2O6Mon.
14.15.2NatalyiteNaV3+Si2O6Mon.
14.15.4KrinoviteNa2Mg4Cr3+2(Si6O18)O2Tric.
14.15.5UvaroviteCa3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d

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.

References for KnorringiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nixon, P.H., Hornung, G. (1968): A new chromium garnet end member, knorringite, from Kimberlite. American Mineralogist 53, 1833-1840.
Ringwood, A.E. (1977): Synthesis of pyrope-knorringite solid solution series. Earth and Planetary Science Letters 36, 443-448.
Juhin, A., Morin, G., Elkaim, E., Frost, D.J., Fialin, M., Juillot, F., Calas, G. (2010): Structure refinement of a synthetic knorringite, Mg3(Cr0.8Mg0.1Si0.1)2(SiO4)3. American Mineralogist 95, 59-63.
Bindi, L., Sirotkina, E.A., Bobrov, A.V., Irifune, T. (2014): Chromium solubility in perovskite at high pressure: The structure of (Mg1-xCrx)(Si1-xCrx)O3 (with x = 0.07) synthesized at 23 GPa and 1600 °C. American Mineralogist 99, 866-869.

Internet Links for KnorringiteHide

Localities for KnorringiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Antarctica
 
  • Eastern Antarctica
    • Transantarctic Mts
      • Buckley Island quadrangle
        • Lewis Cliff
Goodrich, C. A., & Harlow, G. E. (2001). Knorringite-uvarovite garnet and Cr-Eskola pyroxene in ureilite LEW 88774. Meteoritics and Planetary Science Supplement, 36, 68.
Canada
 
  • Québec
    • Abitibi-Témiscamingue
      • La Vallée-de-l'Or RCM
        • Réservoir-Dozois
Olivier Langelier Collection
Lesotho (TL)
 
  • Butha-Buthe District
AmMin 53 (1968), 1833-1840
USA
 
  • California
    • Nevada Co.
      • Washington District (Omega District)
        • Washington
Handbook of Mineralogy
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