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Datolite
Datolite on sphalerite from San Luis Potosí, Mexico (size: 6.2 x 5.3 x 2.8 cm)
Datolite on sphalerite from San Luis Potosí, Mexico (size: 6.2 x 5.3 x 2.8 cm)
Polished datolite nodule from the Quincy Mine of Michigan’s Copper Country (size: 4.1 x 3.3 x 1.7 cm)
Polished datolite nodule from the Quincy Mine of Michigan’s Copper Country (size: 4.1 x 3.3 x 1.7 cm)
Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale
Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale
Talc block
Talc block
Gypse Arignac
Gypse Arignac
Calcite sample 2
Calcite sample 2