Samsonite is a rare silver manganese antimony sulfide which forms monoclinic, prismatic, metallic, steel-black, translucent to opaque, crystals. It occurs in vugs associated with galena, tetrahedrite, pyrargyrite, dyscrasite, and pyrolusite, at the type locality, Samson mine, St Andreasberg, St Andreasberg district, Harz, Lower Saxony, Germany. Samsonite was named in 1910 after its discovery locality. Other localities include: Garpenberg Norra mine, Garpenberg Hedemora, Dalarna, Sweden; Silver Miller mine, Coleman Township, Cobalt-Gowganda region, Timiskaming district, Ontario, Canada.
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