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Dominant species
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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.
Gibbsite5506
Gibbsite5506
Gibbsite5505
Gibbsite5505
Gibbsite5497
Gibbsite5497
Gibbsite5493
Gibbsite5493
Gibbsite5489
Gibbsite5489
Gibbsite5482
Gibbsite5482
Gibbsite5477
Gibbsite5477
Gibbsite5474
Gibbsite5474
Gibbsite5469
Gibbsite5469