Phosgenite
Pb2(CO3)Cl2IMA symbol: Phograndfathered
Phosgenite is a carbonate or nitrate mineral with the formula Pb2(CO3)Cl2, crystallizing in the tetragonal system. It has a Mohs hardness of 2.75-3, typically white, gray or yellow in color, with an adamantine luster, a specific gravity of 2.114. Its streak is white.
Photos
.jpg){kind=link}
.jpg){kind=link}
.jpg){kind=link}
Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 4/m b m |
| Cell (Å, °) | a = 8.16, b = 8.16, c = 8.883; α = 90, β = 90, γ = 90 |
| Cell volume | 591.48 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.0886calculated from COD 9009573 |
| Source structure | COD 9009573 (Tschermaks Mineralogische und Petrographische Mitteilungen, 1974) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.82 | 3.649 | 4.442 | 2.58 | 1.897 | 1.808 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 54.5 | 48.3 | 29.2 | 25.6 | 24.4 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009573; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.124 g/cm³calculated from COD 9009573 |
|---|---|
| Hardness (Mohs) | 2.75-3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.114 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantinesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 545.31 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Pb 75.99%, C 2.2%, O 8.8%, Cl 13% |
Classification
| Nickel-Strunz (10th) | 5.BE.20Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 5.BE.20Wikidata (CC0) |