Vivianite
Fe2+3(PO4)2·8H2OIMA symbol: Vivgrandfathered
Vivianite is a phosphate, arsenate, or vanadate mineral with the formula Fe2+3(PO4)2·8H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 1.5-2, typically colorless, blue, green or red in color, with a metallic or pearly luster, a specific gravity of 2.58-2.68. Its streak is colorless or white.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/m 1 |
| Cell (Å, °) | a = 10.086, b = 13.441, c = 4.703; α = 90, β = 104.27, γ = 90 |
| Cell volume | 617.9 ų, Z = 2 |
| Axial ratios | 0.7504:1:0.3499calculated from COD 1001782 |
| Source structure | COD 1001782 (Bulletin de Mineralogie, 1980) — 1 of 4 structures |
Physical properties
| Density (calculated) | 2.609 g/cm³calculated from COD 1001782 |
|---|---|
| Hardness (Mohs) | 1.5-2single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.58-2.68 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | blue, colorless, green, redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | blue, brown, colorless, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallic, pearly, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 8.CE.40Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.CE.40Wikidata (CC0) |