Triploidite
Mn2+2(PO4)(OH)IMA symbol: Tpdgrandfathered
Triploidite is a phosphate, arsenate, or vanadate mineral with the formula Mn2+2(PO4)(OH). It has a Mohs hardness of 5, typically gray or yellow in color, with a vitreous luster, a specific gravity of 3.697.
Photos
Crystallography
| Space group | P 1 21/a 1 |
|---|---|
| Cell (Å, °) | a = 12.366, b = 13.276, c = 9.943; α = 90, β = 108.23, γ = 90 |
| Cell volume | 1550.42 ų, Z = 16 |
| Axial ratios | 0.9315:1:0.7489calculated from COD 9008190 |
| Source structure | COD 9008190 (Zeitschrift fur Kristallographie, 1970) — 1 of 2 structures |
Physical properties
| Density (calculated) | 3.792 g/cm³calculated from COD 9008190 |
|---|---|
| Hardness (Mohs) | 5single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 3.697 g/cm3corroboratedFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | gray, yellowsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | vitreoussingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Classification
| Nickel-Strunz (10th) | 8.BB.15Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BB.15Wikidata (CC0) |