from The Century Dictionary.
- noun A fluo-arsenate of aluminium, iron, and sodium, occurring in orange-red monoclinic crystals, associated with cassiterite (tin-stone), at Durango, Mexico.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A rare
sodium aluminium arsenate fluoride gemwith brittle crystals, chemical formula NaAl(AsO4)F.
from Wiktionary, Creative Commons Attribution/Share-Alike License
Named after Durango, a region in Mexico which is the main source of the gems.
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