| Datolite
VIII - Nesosilicates |
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| 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) | |