Danalite
Be3Fe2+4(SiO4)3SIMA symbol: Dangrandfathered
Danalite is a silicate mineral with the formula Be3Fe2+4(SiO4)3S, crystallizing in the cubic system. It has a Mohs hardness of 5.5-6, typically gray or red in color, a specific gravity of 5. Its streak is gray or red.
Photos
Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | P -4 3 n |
| Cell (Å, °) | a = 8.2317, b = 8.2317, c = 8.2317; α = 90, β = 90, γ = 90 |
| Cell volume | 557.787 ų, Z = 2 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9004802 |
| Source structure | COD 9004802 (The Canadian Mineralogist, 2003) — 1 of 24 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.361 | 1.94 | 2.2 | 2.603 | 1.12 | 1.372 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 46.9 | 20 | 14.6 | 10.4 | 10.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004802; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.327 g/cm³calculated from COD 9004802 |
|---|---|
| Hardness (Mohs) | 5.5-6single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 5 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | gray, redDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 9.FB.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.FB.10Wikidata (CC0) |
| Dana (8th) | 76.2.4.2Wikidata (CC0) |