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Aikinite is a sulfide mineral of leadcopper and bismuth with formula PbCuBiS3. It forms black to grey or reddish brown acicular orthorhombic crystals with a Mohs hardness of 2 to 2.5 and a specific gravity of 6.1 to 6.8. It was originally found in 1843 in the Beryozovskoye depositUral Mountains. It is named after Arthur Aikin (1773–1854), an English geologist.

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Mineralogy Database Dictionary

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General Information:
 Chemical Formula:
(Molecular Weight = 575.92 gm)
Copper 11.03 % Cu
Bismuth 36.29 % Bi
Lead 35.98 % Pb
Sulfur 16.70 % 
 Empirical Formula:
TL: Berezovsk near Ekaterinburg, Ural Mountains.
Physical Properties:
[010] Indistinct
lead gray, grayish black, or reddish brown.
6.1 - 6.8, Average = 6.44
Acicular - Occurs as needle-like crystals., Massive - Uniformly indistinguishable crystals forming large masses.,
2-2.5 - Gypsum-Finger Nail
grayish black
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