Epidot

$Ca_2(Fe,Al)_3Si_2O_7SiO_4O(OH)$

  Family sorosilicate
  Crystal system monoclinic
  Color pistace green, dark green to black, pink, grey, yellow, colorless
  Streak color white or greyish
  Cleavage 2 cleavages (1 perfect, 1 mediocre)
  Hardness 6 to 7
  Density 3,3 to 3.5

Explanations: → Here List of minerals: → Here