General Information:
Chemical Formula:Al2[Al2.33][Si3AlO10](OH)8
Composition:(Molecular Weight = 524.20 gm)Aluminum 27.45 %
AlSilicon 16.07 %
SiHydrogen 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
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