Triplite
Mn2+2(PO4)FIMA symbol: Trlgrandfathered
Triplite is a phosphate, arsenate, or vanadate mineral with the formula Mn2+2(PO4)F, crystallizing in the monoclinic system. It has a Mohs hardness of 4.5-5, typically black or brown in color, with an adamantine or resinous luster, a specific gravity of 3.44-3.8. Its streak is brown or gray.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | I 1 2/a 1 |
| Cell (Å, °) | a = 12.109, b = 6.5162, c = 10.117; α = 90, β = 106.16, γ = 90 |
| Cell volume | 766.737 ų, Z = 8 |
| Axial ratios | 1.8583:1:1.5526calculated from COD 9017191 |
| Source structure | COD 9017191 (The Canadian Mineralogist, 2014) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.872 | 3.053 | 3.303 | 2.901 | 3.687 | 2.12 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 89.1 | 68.5 | 49.9 | 45.3 | 26.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9017191; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.879 g/cm³calculated from COD 9017191 |
|---|---|
| Hardness (Mohs) | 4.5-5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.44-3.8 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, brownsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | brown, gray, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, resinoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 8.BB.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BB.10Wikidata (CC0) |
| Dana (8th) | 41.6.1.2Wikidata (CC0) |