Datolite
VIII - Nesosilicates |
Name | Datolite | |
Chemistry | CaB[4][OH|SiO4] | |
Hardness | 5.5 | |
Lustre | vitreous | |
Colour | white, colourless, yellowish, reddish grey, grey, brown, green | |
Streak | white | |
Density [g/cm3] | 2.9 - 3.0 | |
Crystal habit | monoclinic, crystals prismatic and richly faced | |
Cleavage, Fracture | fracture conchoidal to uneven | |
other characteristics and occurrences | secondary mineral in cavities of basaltic rocks, also in hydrothermal veins with zeolites, prehnite (CaAl[6][(OH)2|AlSi3O10]) and calcite (CaCO3) | |