aikinite
noun
ai·kin·ite
ˈā-kə-ˌnīt
plural -s
: a mineral PbCuBiS3 consisting of lead, copper, bismuth, and sulfur occurring massive and in lead-gray needle-shaped orthorhombic crystals (hardness 2, specific gravity 7.07)
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Merriam-Webster unabridged
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