General Information:
Chemical Formula:
Al2[Al2.33][Si3AlO10](OH)8
Composition:
(Molecular Weight = 524.20 gm)
Aluminum 27.45 % Al
Silicon 16.07 % Si
Hydrogen 1.54 % H
Oxygen 54.94 % O
Empirical Formula:
Al5.333Si3O10(OH)8
Environment:
Hydrothermal alteration product of andalusite and spodumene.
IMA Status:
Not IMA Approved
Locality:
Utrennyaia shaft and Uralskaya vein, Nagolyn area, Donbass region, Ukraine.
Name Origin:
Named for the location.
Physical Properties:
Cleavage:
[001] Perfect
Color:
white, greenish white, or yellowish white.
Density:
2.63 - 2.64, Average = 2.63
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).,
Hardness:
2-2.5 - Gypsum-Finger Nail
Luster:
Pearly
Streak:
white
More details...