talc the softest mineral

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Description

Talc is known for being the softest mineral on earth. It is number 1 on the Mohs hardness scale, and can be easily scratched by a fingernail. It is not commonly seen in collections, as it is usually uninteresting and fairly common

This is a hydrous magnesium silicate mineral with a chemical composition of Mg3Si4O10(OH)2. Although the composition of talc usually stays close to this generalized formula, some substitution occurs.

Mineral Group  silicate
Composition  Mg3(Si4O10)(OH)2
dimension (cm)  10x2x2
weight (g) 119
 more at geology.com
A form of talc known as “soapstone” is also widely known. This soft rock is easily carved and has been used to make ornamental and practical objects for thousands of years.

Additional information

Weight 119 g
Dimensions 10 x 2 x 2 cm