Is Talc a Mineral? | Howard Fensterman Minerals
Sep 26, 2017· Talc: a composition of magnesium and silicon. Talc is made of two different minerals with water trapped in their structure. Chemically, talc is called magnesium silicate hydroxide. Usually talc remains close to this composition, however, sometimes minor amounts of iron, aluminum, calcium and manganese can be part of talc in place of magnesium.