What is Talc?
[[File:Talc.jpg|thumb|Crystals of talc]] '''Talc''' (from the [[Arabic language|Arabic]] ''talk'') is a [[silicate mineral]], a type of [[clay]]. It is the standard for grade 1 in the [[Mohs scale of mineral hardness]]. A fingernail can easily scratch it. Talc is composed of hydrated [[magnesium]] [[silicate]] with the chemical formula Mg<sub>3</sub>Si<sub>4</sub>O<sub>10</sub>(OH)<sub>2</sub>. Talc and [[pyrophyllite]] are very similar, but pyrophyllite may be slightly harder. Talc has a greasy feel and a translucent, soapy look. In loose form, it is the widely used substance known as talcum powder. [[Steatite]], also called [[soapstone]], is a rock with a lot of talc. [[Category:Minerals]] {{science-stub}}