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Mineralpedia Details for Datolite

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Datolite

Datolite

Named after a translation of a Greek word meaning “to divide,” after the granular structure of the minerals massive variety of formation and habit. Datolite is a relatively uncommon mineral that occurs as a secondary mineral in mafic igneous rocks, geodes, tuffs, skarn in limestone, serpentinites, hornblende schist, and some ore veins. Localities for fine specimens of Datolite include in Norway, Germany, Italy, Austria, Japan, Russia, the USA, and Mexico, among many others. Datolite can fluoresce blue, commonly, under short-wave ultraviolet light.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/datolite.pdf

Formula
CaBSiO4(OH) 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Granular, Porcelainous 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, yellow, white, light green 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
5.5 
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Datolite from Charcas, San Luis Potosi, Mexico

Datolite
            from Charcas, San Luis Potosi, Mexico

Light green lustrous, euhedral crystals to 1.5cm on edge.

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