kreittonite

[Gr. kreitton =stronger; suff. -ite (Min.). Named by Von Kobell.] Min.: A mineral belonging to the group of zinc spinels, or Gahnite (q.v.), in which part of the alumina is replaced by sesquioxide of iron. Hardne , 7-8; specific gravity, 448-4-89. Occurs in greenish-black crystals and granular ma ive, a ociated with pyrrhotite (q.v.), ., at Bodenmais, Bavaria. Originally named Spinellus superior by Breithaupt.