Abstract
Talc, the softest mineral in the world, is a hydrated magnesium sheet silicate, formed by transformation of existing rocks under hydrothermal activity. Properties of talc—including its resistance to heat, electricity, and acids, its platyness and its insolubility—make it a very important industrial mineral. The open-cut mining of talc can therefore be an attractive and profitable industry, provided exploration and production costs are not excessive.
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