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Beautiful quartz hedgehog topped with calcite from the Madan mine in Bulgaria (year 90).
Stone dimensions: L: 97mm x W: 68mm.
Weight: 270g.
Quartz |
SiO2 Hardness: 7 (Mohs scale) Specific gravity: 2.65 |
Calcite |
CaCO3 Hardness: 3 (Mohs scale) Specific gravity: 2.6 à 2.8 |