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The Collaborative International Dictionary
datholite

Datolite \Dat"o*lite\, n. [From. Gr. ? to divide + -lite; in allusion to the granular structure of a massive variety.] (Min.) A borosilicate of lime commonly occuring in glassy,, greenish crystals. [Written also datholite.]

Wiktionary
datholite

n. (alternative spelling of datolite English)