Knorringite (original) (raw)

Long-form identifier:

mindat:1:1:2229:9

c5ce83cc-4438-4148-a84f-fca2cbd34f28

Type description reference:

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

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

Density:

3.756 g/cm3 (Measured) 3.852 g/cm3 (Calculated)

Birefringence:

Isotropic minerals have no birefringence

Mindat Formula:

Mg3Cr2(SiO4)3

Common Impurities:

Ti,Al,Fe,Mn,Ca

Class (H-M):

m_3_m _(_4/_m_32/m ) - Hexoctahedral

Cell Parameters:

a = 11.65 Å

Unit Cell V:

1,581.17 ų (Calculated from Unit Cell)

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0004999	Knorringite	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		2010	synthetic	0	293

CIF Raw Data - click here to close

Powder Diffraction Data:

Comments:

Kao kimberlite pipe, Lesotho. Data from the type description.

General Appearance of Type Material:

Massive and as minute grains.

Place of Conservation of Type Material:

No designated type material.

Geological Setting of Type Material:

Ultramafic kimberlite nodules.

Associated Minerals at Type Locality:

Reference:

Nixon, P.H., Hornung, G. (1968): A new chromium garnet end member, knorringite, from Kimberlite. American Mineralogist 53, 1833-1840

Other Members of this group:

Health Risks:

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

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.

- 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.