Botryogen
MgFe3+(SO4)2(OH)·7H2OIMA symbol: Byggrandfathered
Botryogen is a sulfate mineral with the formula MgFe3+(SO4)2(OH)·7H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 2-2.5, typically red or yellow in color, with a vitreous luster, a specific gravity of 2.04-2.14. Its streak is yellow.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/n 1 |
| Cell (Å, °) | a = 10.4983, b = 17.8372, c = 7.1154; α = 90, β = 100.125, γ = 90 |
| Cell volume | 1311.68 ų, Z = 4 |
| Axial ratios | 0.5886:1:0.3989calculated from COD 9017912 |
| Source structure | COD 9017912 (Neues Jahrbuch fur Mineralogie, Abhandlungen, 2016) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 8.942 | 3.023 | 6.339 | 8.919 | 4.094 | 3.214 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 39.2 | 30.5 | 29.5 | 20.6 | 20 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9017912; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.143 g/cm³calculated from COD 9017912 |
|---|---|
| Hardness (Mohs) | 2-2.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.04-2.14 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | red, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 7.DC.25Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.DC.25Wikidata (CC0) |