Talc

$Mg_3Si_4O_{10}(OH)_2$

  Family phyllosilicates
  Crystal system monoclinic
  Color white, colorless, green, yellow to brown, redish
  Streak color white
  Cleavage no visible cleavage
  Hardness 1
  Density 2,7 to 2,8

Explanations: → Here List of minerals: → Here