danalite

from The Century Dictionary.

• noun A rare mineral, a silicate of iron, zinc, manganese, and glucinum, containing about 6 per cent. of sulphur, found in eastern Massachusetts, in grains and isometric crystals in granite.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Min.) A mineral occuring in octahedral crystals, also massive, of a reddish color. It is a silicate of iron, zinc manganese, and glucinum, containing sulphur.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mineralogy An isometric-hextetrahedral mineral containing beryllium, iron, oxygen, silicon, and sulfur.