Lesson for today

Talcum/Baby Powder is made from pulverising the mineral Talc, which is made up mainly of the elements magnesium, silicon, and oxygen.
Lesson over

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ArishMell · 70-79, M

And is formed by the hydrothermal alteration of ultrabasic rock; or the thermal metamorphism of siliceous dolomites.

Chemical formula: [big]Mg[/big]3.[big]Si[/big]4.[big]O[/big]10([big]OH[/big])2

(Sorry - no subscript setting in SW!)