Datolite is a mineral found both in the form of aggregates and in the form of crystals. Moreover, its habitus is very diverse. The color also varies. Mined as an ore for boron. Also used in jewelry. In Russia, the best examples of collectible datolite come from Primorye.
You can see datolite stone for sale and buy it in the Minerals of Russia online store.
General | |
---|---|
Category | Nesosilicate |
Formula (repeating unit) |
CaBSiO4(OH) |
IMA symbol | Dat |
Strunz classification | 9.AJ.20 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | P21/c |
Unit cell | a = 9.62, b = 7.6 c = 4.84 [Å]; β = 90.15°; Z = 4 |
Identification | |
Color | Colorless or white; may be grayish, yellow, green, pale green, red, pink, etc. |
Crystal habit | Crystal prismatic, short to tabular; Botryoidal or globular with columnar structure; granular to compact; cryptocrystalline |
Cleavage | None |
Fracture | Conchoidal to uneven |
Tenacity | Brittle |
Mohs scale hardness | 5 to 5.5 |
Luster | Vitreous, rarely subresinous on fracture surface |
Diaphaneity | Transparent to translucent, rarely opaque |
Specific gravity | 2.96 – 3.00 |
Optical properties | Biaxial (-) |
Refractive index | nα = 1.626 nβ = 1.653 - 1.654 nγ = 1.670 |
Birefringence | δ = 0.044 |
2V angle | Measured: 74° |
Dispersion | r > v; weak |
Ultraviolet fluorescence | Fluoresces blue under SW UV |