Datolite
Chemical Formula	CaBSiO4(OH)
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	5
Specific Gravity	2.96-3.00
Color	Colorless or white; may be grayish, yellow, green, red, pink
Streak	White
Luster	Vitreous, Resinous
Refractive Index	n = 1.626 n = 1.653 - 1.654 n = 1.670
Diaphaneity	Transparent, Translucent, Opaque
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Crystal prismatic, short to tabular; Botryoidal or globular with columnar structure; granular to compact; cryptocrystalline
Geological Setting：Secondary mineral in mafic igneous rocks. Geodes in tuff, limestone skarns, serpentinites, schists, ore veins.