Source : Webster's Revised Unabridged Dictionary (1913)

Cronstedtite \Cron"stedt*ite\ (kr?n"st?t-?t), n. (Min.)
   A mineral consisting principally of silicate of iron, and
   crystallizing in hexagonal prisms with perfect basal
   cleavage; -- so named from the Swedish mineralogist
   Cronstedt.