Augelite
Al2(PO4)(OH)3IMA symbol: Aulgrandfathered
Augelite is a phosphate, arsenate, or vanadate mineral with the formula Al2(PO4)(OH)3, crystallizing in the monoclinic system. It has a Mohs hardness of 2-3, typically white, brown, red or yellow in color, with an adamantine or greasy luster, a specific gravity of 2.69-5. Its streak is brown or green; cleavage is imperfect or perfect.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/m 1 |
| Cell (Å, °) | a = 13.124, b = 7.988, c = 5.066; α = 90, β = 112.25, γ = 90 |
| Cell volume | 491.547 ų, Z = 4 |
| Axial ratios | 1.6430:1:0.6342calculated from COD 9000172 |
| Source structure | COD 9000172 (American Mineralogist, 1968) |
Physical properties
| Density (calculated) | 2.661 g/cm³calculated from COD 9000172 |
|---|---|
| Hardness (Mohs) | 2-3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 2.69-5 g/cm3single sourceDana's System, 2nd Appendix (1909) |
| Color | brown, red, white, yellowsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | whitesingle sourceWikidata (CC0) brown, green, yellowsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | adamantine, greasysingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Cleavage | imperfect, perfectsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Chemistry (calculated)
| Molecular weight | 199.96 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Al 26.99%, P 15.49%, O 56.01%, H 1.51% |
Classification
| Nickel-Strunz (10th) | 8.BE.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BE.05Wikidata (CC0) |