talc
A hydrous mineral consisting of magnesium-silicate
(3MgO . 4SiO 2 . H 2 O).,
Commercial talc is seldom if ever a pure mineral
and therefore its physical and chemical properties
usually vary over a relatively wide range. A
commercial talc, such as soapstone, when ground
into a very fine powder generally has a soft and
greasy feel and is usually creamy to
greenish-white in color. Talc is used as a filler
in cultural papers, to which it imparts a raglike
feel. (17 )
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