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grahamite

[grey-uh-mahyt]
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noun Mineralogy.
  1. an asphaltite with a pitch-black luster.

Origin of grahamite

1865–70, Americanism; named after J. A. and J. L. Graham, 19th-century American mineowners; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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