Effenbergerite

Effenbergerite is the natural occurrence of the color Han blue.It was first found in the Wessels mine, Kalahari Manganese Field,[1] South Africa.[2] Effenbergerite was approved as a valid mineral species by the IMA in 1993.[3]

General
CategoryMineral
Formula
(repeating unit)
BaCuSi4O10
Strunz classification09.EA.05
Dana classification71.02.03.03
Crystal systemtetragonal
Crystal classP4/ncc
Structure
Identification
Formula mass473.21
Colourblue
Lustervitreous
Streakpale blue
Diaphaneitytransparent
Density3.57 - 3.52
Optical propertiesUniaxial (-)
Refractive indexe=1.593, w=1.633

Effenberergite has the chemical formula BaCuSi4O10.[4]

The mineral was named after Dr. Herta S. Effenberger, a mineralogist and crystallographer at the University of Vienna.[4]

References

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