Datolite
CaB(SiO4)(OH)IMA symbol: Datgrandfathered
Datolite is a silicate mineral with the formula CaB(SiO4)(OH), crystallizing in the monoclinic system. It has a Mohs hardness of 5-5.5, typically white, gray, green or red in color, with a resinous or vitreous luster, a specific gravity of 2.9-3. Its streak is white.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/a 1 |
| Cell (Å, °) | a = 9.646, b = 7.62, c = 4.839; α = 90, β = 90.14, γ = 90 |
| Cell volume | 355.7 ų, Z = 4 |
| Axial ratios | 1.2659:1:0.6350calculated from COD 2102679 |
| Source structure | COD 2102679 (Acta Crystallographica Section B, 2007) — 1 of 18 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.12 | 2.86 | 2.993 | 3.114 | 2.858 | 3.759 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 79.3 | 57.4 | 56.9 | 49.3 | 47.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 2102679; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.988 g/cm³calculated from COD 2102679 |
|---|---|
| Hardness (Mohs) | 5-5.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.9-3 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, green, red, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | resinous, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 159.98 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 25.05%, B 6.76%, Si 17.56%, O 50%, H 0.63% |
Classification
| Nickel-Strunz (10th) | 9.AJ.20Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.AJ.20Wikidata (CC0) |