Aikinite
(repeating unit)Pb Cu Bi S3 IMA symbol Aik[1] Strunz classification 2.HB.05a Dana classification 3.4.5.1 Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group Pnma Unit cell a = 11.297, b = 11.654
c = 4.061 [Å], Z = 4 Identification Formula mass 575.92 g/mol Color Lead gray, grayish black, reddish brown Crystal habit Acicular, massive Cleavage {010} indistinct Mohs scale hardness 2–2.5 Luster Metallic Streak Grayish black Diaphaneity Opaque Specific gravity 6.1–6.8, Average = 6.44 Other characteristics Not radioactive References [2][3] 
H-M symbol: (2/m 2/m 2/m)
c = 4.061 [Å], Z = 4
Aikinite is a sulfide mineral of lead, copper and bismuth with formula Pb Cu Bi S3. 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 deposit, Ural Mountains. It is named after Arthur Aikin (1773–1854), an English geologist.
It has been found in Western Tasmania, in mines located near Dundas, Tasmania
References
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