The Definition of TALCUM

Talc (derived from the Persian tālk) is a mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2. In loose form, it is the widely used substance known as talcum powder. It occurs as foliated to fibrous masses, its crystals being so rare as to be almost unknown. It has a perfect basal cleavage, and the folia are non-elastic, although slightly flexible. It is the softest known mineral and listed as 1 on the Mohs hardness scale. It can be easily scratched by a fingernail. It is also sectile (can be cut with a knife). It has a specific gravity of 2.5–2.8, a clear or dusty luster, and is translucent to opaque. Talc is not soluble in water, but it is slightly soluble in dilute mineral acids. Its colour ranges from white to grey or green and it has a distinctly greasy feel. Its streak is white.

Soapstone is a metamorphic rock composed predominantly of talc.

Talcum powder is a cosmetic product made from finely ground talc, an extremely soft mineral. One of the most common uses of talcum powder is in baby care, with some parents using it to reduce rashes and irritation from diapers. Talcum powder can also be used on adults to prevent chafing and rashes, and some people have come up for creative uses for this product, like sweeping talcum powder into the cracks of wooden floors to prevent them from squeaking.

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