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Effenbergerite in Sugilite

#55276

Effenbergerite in Sugilite

#55276
Availability
Sold
Size
1.5 x 1.5 x 0.8 cm - Thumbnail 
Formula
BaCuSi4O10 (RRUFF)
Locality
Wessels mine, Hotazel, Kalahari Mn fields, Northern Cape Province, South Africa

Blue splotches of Effengbergerite in purple Sugilite. It is just a basic barium copper silicate but very rare having been found in only one locality.

Effenbergerite

Formula
BaCuSi4O10 
Crystal System
Tetragonal 
Crystal Habit
Platy 
Cleavage
Perfect, Poor, None 
Luster
Vitreous - Resinous 
Color
blue 
Streak
pale blue 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Brittle 
Hardness
4-5 

Data courtesy of Webmineral.

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