TRIPLITE

Noun

triplite (countable and uncountable, plural triplites)

(mineral) A rare manganese-bearing phosphate mineral.

Source: Wiktionary

Trip"lite, n. Etym: [Cf. F. triplite. See Triple.] (Min.)

Definition: A mineral of a dark brown color, generally with a fibrous, massive structure. It is a fluophosphate of iron and manganese.

Source: Webster’s Unabridged Dictionary 1913 Edition