Hollandite
Ba(Mn4+6Mn3+2)O16IMA symbol: Holredefined
Hollandite is an oxide or hydroxide mineral with the formula Ba(Mn4+6Mn3+2)O16, crystallizing in the monoclinic system. It has a specific gravity of 3-3.1.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | I 4/m |
| Cell (Å, °) | a = 10.1541, b = 10.1541, c = 2.9735; α = 90, β = 90, γ = 90 |
| Cell volume | 306.585 ų, Z = 2 |
| Axial ratios | 1.0000:1:0.2928calculated from COD 9011327 |
| Source structure | COD 9011327 (Acta Crystallographica, Section B, 2007) — 1 of 13 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.211 | 2.488 | 5.077 | 7.18 | 1.592 | 1.897 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 60.1 | 49.4 | 44.8 | 43.8 | 38.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011327; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.691 g/cm³calculated from COD 9011327 |
|---|---|
| Specific gravity | 3-3.1 g/cm3single sourceDana's System, 2nd Appendix (1909) |
Classification
| Nickel-Strunz (10th) | 4.DK.05aWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.DK.05Wikidata (CC0) |