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Knorringite

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Oleg von Knorring
Formula:
Mg3Cr2(SiO4)3
System:
Isometric
Colour:
Green, blue
Hardness:
6 - 7
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.

Classification of Knorringite

Approved 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
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First Recorded Occurrence of Knorringite

Year of Discovery:
1968

Physical Properties of Knorringite

Vitreous
Colour:
Green, blue
Streak:
White
Hardness (Mohs):
6 - 7

Crystallography of Knorringite

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

Optical Data of Knorringite

Type:
Isotropic

Chemical Properties of Knorringite

Formula:
Mg3Cr2(SiO4)3
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Fe,Mn,Ca

Relationship of Knorringite to other Species

Series:
Forms a series with Pyrope (see here)
Other Members of Group:
AlmandineFe32+Al2(SiO4)3
AndraditeCa3Fe23+(SiO4)3
BerzeliiteNaCa2(Mg,Mn2+)2(AsO4)3
BitikleiteCa3SbSn(AlO4)3
BlythiteMn32+Mn23+[SiO4]3
Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3
DzhuluiteCa3SbSnFe33+O12
ElbrusiteCa3U6+ZrFe23+Fe2+O12
GoldmaniteCa3V23+(SiO4)3
GrossularCa3Al2(SiO4)3
HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
HutcheoniteCa3Ti2(SiAl2)O12
IrinarassiteCa3Sn2Al2SiO12
KatoiteCa3Al2(SiO4)3-x(OH)4x
KerimasiteCa3Zr2(SiO4)(Fe3+O4)2
KhohariteMg3Fe23+(SiO4)3
KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3
MajoriteMg3(Fe2+,Si,Al)2(SiO4)3
Menzerite-(Y){(Y,REE),(Ca,Fe2+)}3{(Mg,Fe2+),(Fe3+,Al)}2[SiO4]3
Momoiite(Mn2+,Ca)3V23+(SiO4)3
MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3
Palenzonaite(Ca,Na)3CaMn22+(VO4)3
PyropeMg3Al2(SiO4)3
SchäferiteCa2NaMg2(VO4)3
SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
SkiagiteFe32+Fe23+[SiO4]3
SpessartineMn32+Al2(SiO4)3
ToturiteCa3Sn2(SiO4)(Fe3+O4)2
UsturiteCa3SbZr(Fe3+O4)3
UvaroviteCa3Cr2(SiO4)3
YafsoaniteCa3Zn3(TeO6)2
9.AD.05LarniteCa2SiO4
9.AD.10Calcio-olivineCa2SiO4
9.AD.15MerwiniteCa3Mg(SiO4)2
9.AD.20BredigiteCa7Mg(SiO4)4
9.AD.25AndraditeCa3Fe23+(SiO4)3
9.AD.25AlmandineFe32+Al2(SiO4)3
9.AD.25Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3
9.AD.25GoldmaniteCa3V23+(SiO4)3
9.AD.25GrossularCa3Al2(SiO4)3
9.AD.25HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
9.AD.25HibschiteCa3Al2(SiO4)3-x(OH)4x
9.AD.25HydroandraditeCa3Fe23+(SiO4)3-x(OH)4x
9.AD.25KatoiteCa3Al2(SiO4)3-x(OH)4x
9.AD.25KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3
9.AD.25MajoriteMg3(Fe2+,Si,Al)2(SiO4)3
9.AD.25MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3
9.AD.25PyropeMg3Al2(SiO4)3
9.AD.25SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
9.AD.25SpessartineMn32+Al2(SiO4)3
9.AD.25UvaroviteCa3Cr2(SiO4)3
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3
9.AD.25HoltstamiteCa3(Al,Mn3+)2(SiO4)2(OH)4
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2
9.AD.25Momoiite(Mn2+,Ca)3V23+(SiO4)3
9.AD.25EltyubyuiteCa12Fe103+Si4O32Cl6
9.AD.25HutcheoniteCa3Ti2(SiAl2)O12
9.AD.30Coffinite(U4+,Th)(SiO4)1-x(OH)4x
9.AD.30HafnonHfSiO4
9.AD.30Thorite(Th,U)SiO4
9.AD.30ZirconZrSiO4
9.AD.30StetinditeCe4+SiO4
9.AD.35HuttoniteThSiO4
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2x
9.AD.40EulytineBi4(SiO4)3
9.AD.45ReiditeZrSiO4
14.15.1KosmochlorNaCrSi2O6
14.15.2NatalyiteNa(V3+,Cr)Si2O6
14.15.4KrinoviteNa2Mg4Cr23+(Si6O18)O2
14.15.5UvaroviteCa3Cr2(SiO4)3

Other Names for Knorringite

Name in Other Languages:
German:Knorringit
Spanish:Knorringita

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 Knorringite

Reference List:
American Mineralogist (1968): 53: 1833-1840.

Internet Links for Knorringite

Localities for Knorringite

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.
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
 
  • Butha-Buthe District
AmMin 53 (1968), 1833-1840
USA
 
  • California
    • Nevada Co.
      • Washington District (Omega District)
        • Washington
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