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Quartz and galena in association with a small calcite in the centre from the Madan Bulgaria mine in the 1990s.
Galena is composed of lead sulphide. Its chemical composition is PbS and its hardness is 2.5 on the Mohs scale.
Dimensions of the stone: L: 60mm x W: 50mm x H : 20mm.
Weight: 111g.