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Leucopyrite
Leucopyrite Leu*cop"y*rite (l[-u]*k[o^]p"[i^]*r[imac]t), n.
[Leuco- + pyrites.] (Min.)
A mineral of a color between white and steel-gray, with a
metallic luster, and consisting chiefly of arsenic and iron.
Meaning of Leucopyrite from wikipedia