Gibbsite | |
Chemical Formula |
Al(OH)3 |
Species |
Oxides & Hydroxides |
Crystal System |
Monoclinic |
Mohs Scale |
2-3 |
Specific Gravity |
2.44 |
Color |
White, light gray, light green, reddish white; reddish yellow (impure) |
Streak |
White |
Luster |
Vitreous, Sub-Vitreous, Pearly, Dull, Earthy |
Refractive Index |
n = 1.568 - 1.570 n = 1.568 - 1.570 n = 1.586 - 1.587 |
Diaphaneity |
Transparent, Translucent |
Cleavage |
Perfect, but rarely observed because of its fine-grained nature. |
Fracture |
Irregular/Uneven |
Crystal Habit:Almost always earthy and nodular; rare crystals tabular , with and usually well-developed. |