bismuthinite
noun
bis·muth·in·ite
ˈbizməthə̇ˌnīt,
ˈbism-,
-mət͟hə̇ˌ-;
(ˈ)biz¦mə-,
-myü-
plural -s
: a mineral Bi2S3 consisting of native bismuth sulfide usually in foliated or fibrous masses of lead-gray color and metallic luster
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Merriam-Webster unabridged
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