Valentinite
Sb2O3IMA symbol: Vlnapproved
Valentinite is an oxide or hydroxide mineral with the formula Sb2O3, crystallizing in the orthorhombic system. It has a Mohs hardness of 2.5-3, typically white, brown, gray or red in color, with an adamantine or pearly luster, a specific gravity of 15.8. Its streak is white.
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Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P c c n |
| Cell (Å, °) | a = 4.8996, b = 12.449, c = 5.4103; α = 90, β = 90, γ = 90 |
| Cell volume | 330.002 ų, Z = 4 |
| Axial ratios | 0.3936:1:0.4346calculated from COD 9009748 |
| Source structure | COD 9009748 (Dalton Transactions, 2004) — 1 of 5 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.137 | 3.112 | 1.802 | 3.486 | 4.559 | 1.925 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 29.9 | 24.2 | 22.9 | 17.1 | 15.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009748; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 5.868 g/cm³calculated from COD 9009748 |
|---|---|
| Hardness (Mohs) | 2.5-3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 15.8 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, gray, red, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, pearlysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 291.52 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Sb 83.54%, O 16.46% |
Classification
| Nickel-Strunz (10th) | 4.CB.55Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.CB.55Wikidata (CC0) |
| Dana (8th) | 4.3.11.1Wikidata (CC0) |