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Specific Gravity

The specific gravity of minerals is, in short, the weight of a mineral, which is determined by its density, as a rule ofr thumb, metallic minerals are more dense and heavier than other types of minerals, thus, a Galena specimen is much heavier than a gypsum specimen with the same dimensions, and is not related to its hardness.

Galena Mineral Specimen
Gypsum Mineral Specimen