Tapiolite-(Fe)
Fe2+Ta2O6IMA symbol: Tap-Ferenamed
Tapiolite-(Fe) is an oxide or hydroxide mineral with the formula Fe2+Ta2O6, crystallizing in the tetragonal system. It has a Mohs hardness of 6, typically black in color, with an adamantine or metallic luster, a specific gravity of 7.36. Its streak is colorless or gray.
Photos
Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 42/m n m |
| Cell (Å, °) | a = 4.7511, b = 4.7511, c = 9.2648; α = 90, β = 90, γ = 90 |
| Cell volume | 209.134 ų, Z = 2 |
| Axial ratios | 1.0000:1:1.9500calculated from COD 9014184 |
| Source structure | COD 9014184 (Mineralogical Magazine, 2006) — 1 of 31 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.36 | 2.589 | 1.75 | 2.376 | 1.409 | 1.68 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 81 | 65.3 | 24.1 | 18.9 | 16.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9014184; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 7.976 g/cm³calculated from COD 9014184 |
|---|---|
| Hardness (Mohs) | 6single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 7.36 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | blacksingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | colorless, graysingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | adamantine, metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 4.DB.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.DB.10Wikidata (CC0) |