cronstedtite

noun

cron·​stedt·​ite

ˈkränˌstetˌīt

plural -s

: a mineral consisting of a black hydrous iron silicate of the chlorite group, crystallizing in hexagonal prisms with perfect basal cleavage, and showing a dark green streak (specific gravity 3.34–3.35)

Word History

Etymology

German cronstedit, from Baron Axel F. Cronstedt †1765 Swedish mineralogist + German -it -ite

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