Chondrodite
Mg5(SiO4)2F2IMA symbol: Chngrandfathered
Chondrodite is a silicate mineral with the formula Mg5(SiO4)2F2, crystallizing in the monoclinic system. It has a Mohs hardness of 6-6.5, typically brown, red or yellow in color, with a vitreous luster, a specific gravity of 3.1-3.2. Cleavage is distinct.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 21/b 1 1 |
| Cell (Å, °) | a = 4.7401, b = 10.2843, c = 7.8831; α = 109.097, β = 90, γ = 90 |
| Cell volume | 363.141 ų, Z = 2 |
| Axial ratios | 0.4609:1:0.7665calculated from COD 9002577 |
| Source structure | COD 9002577 (American Mineralogist, 2001) — 1 of 15 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.624 | 3.028 | 2.519 | 2.675 | 1.744 | 1.745 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 80 | 79.6 | 77.7 | 77.2 | 73.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9002577; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.162 g/cm³calculated from COD 9002577 |
|---|---|
| Hardness (Mohs) | 6-6.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.1-3.2 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, red, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | distinctDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 343.69 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Mg 35.36%, Si 16.34%, O 37.24%, F 11.06% |
Classification
| Nickel-Strunz (10th) | 9.AF.45Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.AF.45Wikidata (CC0) |