Staurotide
$Fe_2Al_9O_6(SiO_4)_4(O,OH)_2$
Family
neosilicates
Crystal system
monoclinic
Color
brown-red to brown-black
Streak color
white
Cleavage
1 good cleavage
Hardness
7 to 7,5
Density
3,7 to 3,8
Explanations: →
Here
List of minerals: →
Here
