Pyrophanite
Mn2+TiO3IMA symbol: Pphgrandfathered
Pyrophanite is an oxide or hydroxide mineral with the formula Mn2+TiO3, crystallizing in the trigonal system. It has a Mohs hardness of 5, typically red in color, with a submetallic or vitreous luster, a specific gravity of 4.537. Its streak is yellow.
Photos
,_Calcite-258528.jpg){kind=link}
Crystallography
| Crystal system | trigonal crystal systemWikidata (CC0) |
|---|---|
| Space group | R -3 :H |
| Cell (Å, °) | a = 5.1303, b = 5.1303, c = 14.2428; α = 90, β = 90, γ = 120 |
| Cell volume | 324.647 ų, Z = 6 |
| Axial ratios | 1.0000:1:2.7762calculated from COD 9010581 |
| Source structure | COD 9010581 (The Canadian Mineralogist, 2006) — 1 of 12 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.779 | 2.565 | 1.742 | 1.885 | 1.519 | 1.481 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 64.8 | 45.4 | 37.9 | 32.2 | 31.5 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9010581; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.534 g/cm³calculated from COD 9010581 |
|---|---|
| Hardness (Mohs) | 5Ford, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 4.537 g/cm3Ford, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | redFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | yellowFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | submetallic, vitreousFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Classification
| Nickel-Strunz (10th) | 4.CB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.CB.05Wikidata (CC0) |
| Dana (8th) | 4.3.5.3Wikidata (CC0) |