Anhydrite
$CaSO_4$
Family
sulfates
Crystal system
orthorhombiic
Color
white, white reddish, grey
Streak color
white
Cleavage
3 cleavages (1 perfect, 2 good)
Hardness
3,0 to 3,5
Density
2,9 to 3,0
Explanations: →
Here
List of minerals: →
Here