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Knorringite

Formula:
Mg
 
3
Cr
 
2
[SiO
 
4
]
 
3
System:IsometricColour:Green, blue
Hardness:6 - 7
Name:For Oleg Von Knorring (1915-1994), Professor of Mineralogy, University of Leeds, England.


Garnet Group. Knorringite-Pyrope Series.

Classification of Knorringite

IMA status:Approved 1968
Strunz 8th edition ID:8/A.08-50
Nickel-Strunz 10th (pending) edition ID:9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
Dana 8th edition ID:51.4.3a.4

51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Hey's CIM Ref.:14.15.3

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

Type Locality:Kao kimberlite pipe, Butha-Buthe District, Lesotho
Year of Discovery:1968

Physical Properties of Knorringite

Lustre: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:
Mg
 
3
Cr
 
2
[SiO
 
4
]
 
3
Essential elements:Cr, Mg, O, Si
All elements listed in formula:Cr, Mg, O, Si
Common Impurities:Ti,Al,Fe,Mn,Ca

Relationship of Knorringite to other Species

Series:Forms a series with Pyrope (see here)
Member of:Garnet Group
Related Minerals - Nickel-Strunz Grouping):
9.AD.05Larnite
Ca
 
2
[SiO
 
4
]
9.AD.05Calcio-Olivine
Ca
 
2
[SiO
 
4
]
9.AD.15Merwinite
Ca
 
3
Mg[SiO
 
4
]
 
2
9.AD.20Bredigite
Ca
 
7
Mg[SiO
 
4
]
 
4
9.AD.25Andradite
Ca
 
3
Fe
3+
2
[SiO
 
4
]
 
3
9.AD.25Almandine
Fe
2+
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Calderite
(Mn
2+
 
,Ca)
 
3
(Fe
3+
 
,Al)
 
2
[SiO
 
4
]
 
3
9.AD.25Goldmanite
Ca
 
3
(V
3+
 
,Al,Fe
3+
 
)
 
2
[SiO
 
4
]
 
3
9.AD.25Grossular
Ca
 
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Henritermierite
Ca
 
3
(Mn
3+
 
,Al)
 
2
[(OH)
 
4
|(SiO
 
4
)
 
2
]
9.AD.25Hibschite
Ca
 
3
Al
 
2
[(OH)
 
6-1
|(SiO
 
4
)
 
1.5-2.5
]
9.AD.25Hydroandradite
9.AD.25Katoite
Ca
 
3
Al
 
2
[(OH)
 
8-6
|(SiO
 
4
)
 
1-1.5
]
9.AD.25Kimzeyite
Ca
 
3
(Zr,Ti)
 
2
[(Si,Al,Fe
3+
 
)O
 
4
]
 
3
9.AD.25Majorite
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
[SiO
 
4
]
 
3
9.AD.25Morimotoite
Ca
 
3
(Ti,Fe
2+
 
,Fe
3+
 
)
 
2
[(Si,Fe
3+
 
)O
 
4
]
 
3
 (?)
9.AD.25Pyrope
Mg
 
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Schorlomite
Ca
 
3
(Ti,Fe
3+
 
)
 
2
[(Si,Fe
3+
 
,Fe
2+
 
)O
 
4
]
 
3
9.AD.25Spessartine
Mn
2+
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Uvarovite
Ca
 
3
Cr
 
2
[SiO
 
4
]
 
3
9.AD.25Wadalite
Ca
 
6
(Al,Mg)
 
4
[Cl
 
3
|O
 
4
|{(Si,Al,Fe
3+
 
)O
 
4
}
 
3
]
9.AD.25Holtstamite
Ca
 
3
(Al,Mn
3+
 
)
 
2
(SiO
 
4
)
 
2
(OH)
 
4
9.AD.30Coffinite
(U,Th)[(OH)
 
4x
|(SiO
 
4
)
 
1-x
]
9.AD.30Hafnon
(Hf,Zr)[SiO
 
4
]
9.AD.30Thorite
(Th,U)[SiO
 
4
]
9.AD.30Thorogummite
(Th,U)[(OH)
 
4x
|(SiO
 
4
)
 
1-x
]
9.AD.30Zircon
Zr[SiO
 
4
]
9.AD.35Huttonite
Th[SiO
 
4
]
9.AD.35Tombarthite-(Y)
Y
 
4
[HSiO
 
4
]
 
3
9.AD.40Eulytine
Bi
 
4
[SiO
 
4
]
 
3
9.AD.45Reidite
Zr[SiO
 
4
]
Related Minerals - Hey's Index Grouping:
14.15.1Kosmochlor
NaCr[Si
 
2
O
 
6
]
14.15.2Natalyite
Na(V
3+
 
,Cr)[Si
 
2
O
 
6
]
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 Knorringite

Synonyms:
IMA1968-010
German names:
Knorringit
Spanish names:
Knorringita

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 Knorringite

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

Internet Links for Knorringite

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    Localities for Knorringite

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