General Information:
Chemical Formula:
Al2(AsO4)(OH)3·3(H2O)
Composition:
(Molecular Weight = 297.95 gm)
Aluminum 18.11 % Al
Arsenic 25.15 % As
Hydrogen 3.04 % H
Oxygen 53.70 % O
Empirical Formula:
Al2(AsO4)(OH)3·3(H2O)
Locality:
Neubulach, northern Black Forest, Germany.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
None
Color:
colorless, white, or light green.
Density:
2.6
Diaphaniety:
Translucent
Habits:
Acicular - Occurs as needle-like crystals., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite),
Hardness:
2 - Gypsum
Luster:
Silky
Streak:
white
More details...