Adelite
CaMg(AsO4)(OH)IMA symbol: Adegrandfathered
Adelite is a phosphate, arsenate, or vanadate mineral with the formula CaMg(AsO4)(OH), crystallizing in the orthorhombic system. It has a Mohs hardness of 5, typically gray or yellow in color, with a greasy luster, a specific gravity of 4.17. Cleavage is none.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 21 21 21 |
| Cell (Å, °) | a = 7.468, b = 8.953, c = 5.941; α = 90, β = 90, γ = 90 |
| Cell volume | 397.221 ų, Z = 4 |
| Axial ratios | 0.8341:1:0.6636calculated from COD 9012798 |
| Source structure | COD 9012798 (Experimental Mineralogy, Petrology and Geochemistry Abstract Volume, 2002) |
Powder X-ray diffraction (calculated)
| d (Å) | 3.161 | 2.582 | 2.511 | 2.771 | 4.126 | 2.638 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 48.9 | 47.5 | 40.1 | 35.7 | 30.7 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9012798; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.633 g/cm³calculated from COD 9012798 |
|---|---|
| Hardness (Mohs) | 5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.17 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | gray, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | greasysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | noneDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 220.31 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 18.19%, Mg 11.03%, As 34.01%, O 36.31%, H 0.46% |
Classification
| Nickel-Strunz (10th) | 8.BH.35Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BH.35Wikidata (CC0) |