Leadhillite
Pb4(SO4)(CO3)2(OH)2IMA symbol: Lhigrandfathered
Leadhillite is a carbonate or nitrate mineral with the formula Pb4(SO4)(CO3)2(OH)2, crystallizing in the monoclinic system. It has a Mohs hardness of 2-5, typically white, gray, green or yellow in color, with an adamantine or pearly luster, a specific gravity of 6.6. Its streak is red.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/a 1 |
| Cell (Å, °) | a = 9.104, b = 20.792, c = 11.577; α = 90, β = 90.5, γ = 90 |
| Cell volume | 2191.33 ų, Z = 8 |
| Axial ratios | 0.4379:1:0.5568calculated from COD 9003814 |
| Source structure | COD 9003814 (American Mineralogist, 2005) — 1 of 2 structures |
Physical properties
| Density (calculated) | 6.528 g/cm³calculated from COD 9003814 |
|---|---|
| Hardness (Mohs) | 2-5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 6.6 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, green, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, pearly, resinoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 1078.9 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Pb 76.82%, S 2.97%, O 17.8%, C 2.23%, H 0.19% |
Classification
| Nickel-Strunz (10th) | 5.BF.40Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 5.BF.40Wikidata (CC0) |
| Dana (8th) | 17.1.2.1Wikidata (CC0) |