Amblygonite
LiAl(PO4)FIMA symbol: Abygrandfathered
Amblygonite is a phosphate, arsenate, or vanadate mineral with the formula LiAl(PO4)F, crystallizing in the triclinic system. It has a Mohs hardness of 6, typically white, brown, gray or green in color, with a greasy or pearly luster, a specific gravity of 3.01-3.09. Its streak is white.
Photos
Crystallography
| Crystal system | triclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C -1 |
| Cell (Å, °) | a = 6.6815, b = 7.716, c = 6.9565; α = 90.777, β = 117.617, γ = 91.275 |
| Cell volume | 317.583 ų, Z = 4 |
| Axial ratios | 0.8659:1:0.9016calculated from COD 9002880 |
| Source structure | COD 9002880 (American Mineralogist, 2003) — 1 of 7 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.959 | 3.152 | 4.635 | 3.179 | 3.309 | 3.23 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 99.5 | 67.2 | 63.1 | 50.1 | 45.3 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9002880; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.067 g/cm³calculated from COD 9002880 |
|---|---|
| Hardness (Mohs) | 6single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.01-3.09 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, gray, green, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | greasy, pearly, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 147.89 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Li 4.69%, Al 18.24%, P 20.94%, O 43.27%, F 12.85% |
Classification
| Nickel-Strunz (10th) | 8.BB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BB.05Wikidata (CC0) |