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allemontite

[al-uh-mon-tahyt]
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noun
  1. a white to gray, brittle mineral, antimony arsenide, AsSb, occurring in reniform masses: formerly used as an ore of arsenic.

Origin of allemontite

1830–40; named after Allemont (place in France where found); see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018