Lanarkite
Pb2O(SO4)IMA symbol: Langrandfathered
Lanarkite is a sulfate mineral with the formula Pb2O(SO4), crystallizing in the monoclinic system. It has a Mohs hardness of 2.2-5.2, typically white, gray, green or yellow in color, with an adamantine or pearly luster, a specific gravity of 6.3-6.4. Its streak is white; cleavage is perfect.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/m 1 |
| Cell (Å, °) | a = 13.769, b = 5.698, c = 7.079; α = 90, β = 115.93, γ = 90 |
| Cell volume | 499.477 ų, Z = 4 |
| Axial ratios | 2.4165:1:1.2424calculated from COD 9011421 |
| Source structure | COD 9011421 (Zeitschrift fur Kristallographie, 1970) |
Powder X-ray diffraction (calculated)
| d (Å) | 3.343 | 2.964 | 2.849 | 2.052 | 2.958 | 2.867 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 76.8 | 36.4 | 27 | 23.7 | 17.9 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011421; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 7.001 g/cm³calculated from COD 9011421 |
|---|---|
| Hardness (Mohs) | 2.2-5.2single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 6.3-6.4 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, green, white, yellowDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whiteDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, pearly, resinousDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | perfectDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 526.46 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Pb 78.71%, O 15.2%, S 6.09% |
Classification
| Nickel-Strunz (10th) | 7.BD.40Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.BD.40Wikidata (CC0) |