Mimetite
Pb5(AsO4)3ClIMA symbol: Mimgrandfathered
Mimetite is a phosphate, arsenate, or vanadate mineral with the formula Pb5(AsO4)3Cl, crystallizing in the hexagonal system. It has a Mohs hardness of 3-5, typically colorless, white, brown or orange in color, with a resinous luster, a specific gravity of 7.218. Its streak is white.
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Crystallography
| Crystal system | hexagonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 63/m |
| Cell (Å, °) | a = 10.211, b = 10.211, c = 7.4185; α = 90, β = 90, γ = 120 |
| Cell volume | 669.9 ų, Z = 2 |
| Axial ratios | 1.0000:1:0.7265calculated from COD 5000228 |
| Source structure | COD 5000228 (Canadian Mineralogist, 1991) — 1 of 20 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.047 | 3.001 | 2.948 | 2.103 | 3.342 | 1.988 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 93.2 | 51.1 | 34.4 | 31.3 | 31.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 5000228; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 7.378 g/cm³calculated from COD 5000228 |
|---|---|
| Hardness (Mohs) | 3-5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 7.218 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, colorless, orange, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | resinoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 1488.21 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Pb 69.61%, As 15.1%, O 12.9%, Cl 2.38% |
Classification
| Nickel-Strunz (10th) | 8.BN.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BN.05Wikidata (CC0) |