Wollastonite

$CaSiO_3$

  Family inosilicates
  Crystal system triclinic
  Color white, grey, green
  Streak color white
  Cleavage 2 perfect cleavages at 87°
  Hardness 5 to 5,5
  Density 2,8 to 2,9

Explanations: → Here List of minerals: → Here