Hopeite
Zn3(PO4)2·4H2OIMA symbol: Hopgrandfathered
Hopeite is a phosphate, arsenate, or vanadate mineral with the formula Zn3(PO4)2·4H2O, crystallizing in the orthorhombic system. It has a Mohs hardness of 2.5-3, typically white, brown, gray or red in color, with a pearly or vitreous luster, a specific gravity of 3.338. Its streak is white.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P b n m |
| Cell (Å, °) | a = 5.0135, b = 10.6044, c = 18.2828; α = 90, β = 90, γ = 90 |
| Cell volume | 972.008 ų, Z = 4 |
| Axial ratios | 0.4728:1:1.7241calculated from COD 9014818 |
| Source structure | COD 9014818 (Chemistry - A European Journal, 2004) — 1 of 6 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.849 | 9.141 | 4.571 | 3.384 | 4.399 | 3.462 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 59.9 | 49.1 | 47.5 | 39.2 | 31.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9014818; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.131 g/cm³calculated from COD 9014818 |
|---|---|
| Hardness (Mohs) | 2.5-3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.338 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| 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 | pearly, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 458.23 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Zn 42.82%, P 13.52%, O 41.9%, H 1.76% |
Classification
| Nickel-Strunz (10th) | 8.CA.30Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.CA.30Wikidata (CC0) |