Beryllonite
NaBe(PO4)IMA symbol: Belgrandfathered
Beryllonite is a phosphate, arsenate, or vanadate mineral with the formula NaBe(PO4), crystallizing in the monoclinic system. It has a Mohs hardness of 5.5-6, typically colorless, white or yellow in color, with a pearly or vitreous luster, a specific gravity of 2.845. Its streak is white; cleavage is perfect.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/n 1 |
| Cell (Å, °) | a = 8.178, b = 7.818, c = 14.114; α = 90, β = 90, γ = 90 |
| Cell volume | 902.387 ų, Z = 12 |
| Axial ratios | 1.0460:1:1.8053calculated from COD 9009570 |
| Source structure | COD 9009570 (Tschermaks Mineralogische und Petrographische Mitteilungen, 1973) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.822 | 3.616 | 3.909 | 2.826 | 3.623 | 2.258 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 80.1 | 49.1 | 48.5 | 42.8 | 40.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009570; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.804 g/cm³calculated from COD 9009570 |
|---|---|
| Hardness (Mohs) | 5.5-6single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.845 g/cm3Dana, System of Mineralogy, 6th ed. (1892) |
| Color | colorless, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) |
| Luster | pearly, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | perfectDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 126.97 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Na 18.11%, Be 7.1%, P 24.39%, O 50.4% |
Classification
| Nickel-Strunz (10th) | 8.AA.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.AA.10Wikidata (CC0) |
| Dana (8th) | 38.1.5.1Wikidata (CC0) |