Roger Weller, geology instructor
email@example.com copyright 2010-R.Weller
Talc is is one of the softest of all minerals and holds the place of 1 on Mohs scale
of hardness. It is metamorphic mineral with a composition of hydrous magnesium
silicate. Talc has a pearly luster and a soapy feeling. When ground to a fine powder
and scented with perfume, it becomes talcum powder.
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Just credit photo to R.Weller/Cochise College.