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Mineralpedia Details for Effenbergerite

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Effenbergerite

Effenbergerite

Named for mineralogist and crystallographer at the University of Vienne, Dr. Herta S. Effenberger. A rare mineral that can be found only at the type locality at the Wessels mine in the Northern Cape Province of South Africa. It is found with native copper, calcite, quartz, and clinozoisite within veinlets of pectolite that are embedded in braunite ore. Effenbergerite appears as blue plates.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

IMA/CNMNC List of Mineral Names (2009) and Mineralogical Magazine 58 (1994) 663

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 
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Effenbergerite from Wessels mine, Hotazel, Kalahari Mn fields, Northern Cape Province, South Africa

Effenbergerite
            from Wessels mine, Hotazel, Kalahari Mn fields, Northern Cape Province, South Africa

Rich blue, prismatic crystals to 3mm embedded in matrix with Sugilite.

Granular Effenbergite crystals in matrix.

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