General Information:
Chemical Formula:
Pb4As2S7
Composition:
(Molecular Weight = 1,203.11 gm)
Arsenic 12.45 % As
Lead 68.89 % Pb
Sulfur 18.66 % S
Empirical Formula:
Pb4As2S7
Environment:
Found in a veinlet of barite at the Yunosawa mine.
IMA Status:
Accepted IMA 1998
Locality:
Minami-Tsugara-gun provincial unit of the Aomori Prefecture in northern Japan.
Name Origin:
Named after the discovery locality.
Physical Properties:
Color:
silvery lead gray.
Diaphaniety:
Opaque
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Metallic
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