Knorringite
Mg3Cr2(SiO4)3IMA symbol: Krrapproved
Knorringite is a silicate mineral with the formula Mg3Cr2(SiO4)3, crystallizing in the cubic system. It has a calculated density of 3.793 g/cm3.
Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
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| Space group | I a -3 d |
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| Cell (Å, °) | a = 11.5935, b = 11.5935, c = 11.5935; α = 90, β = 90, γ = 90 |
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| Cell volume | 1558.27 ų, Z = 8 |
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| Axial ratios | 1.0000:1:1.0000calculated from COD 9013702 |
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| Source structure | COD 9013702 (American Mineralogist, 2010) |
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Powder X-ray diffraction (calculated)
| d (Å) | 1.549 | 2.898 | 2.592 | 2.367 | 1.608 | 4.099 |
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| I/I₀ | 100 | 85.4 | 82.4 | 67.7 | 36.6 | 34.8 |
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xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9013702; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.793 g/cm³calculated from COD 9013702 |
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Chemistry (calculated)
| Molecular weight | 453.16 g/molcalculated from the IMA formula |
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| Composition (wt%) | Mg 16.09%, Cr 22.95%, Si 18.59%, O 42.37% |
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Classification
| Nickel-Strunz (10th) | 9.AD.25Wikidata (CC0) |
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| Nickel-Strunz (9th) | 9.AD.25Wikidata (CC0) |
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| Dana (8th) | 51.4.3a.4Wikidata (CC0) |
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