Chemistry:Effenbergerite

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Short description: Blue mineral
Effenbergerite-160236.jpg
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
|re|er}}vitreous
Streakpale blue
Diaphaneitytransparent
Density3.57 - 3.52
Optical propertiesUniaxial (-)
Refractive indexe=1.593, w=1.633

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]

Effenberergite has the chemical formula BaCuSi
4O
10.[4]

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

References

  1. ↑ "The Kalahari Manganese Fields | Cape Minerals". https://www.capeminerals.co.za/the-kalahari-manganese-fields. 
  2. ↑ Giester, G.; Rieck, B. (December 1994). "Effenbergerite, BaCu[Si4O10, a new mineral from the Kalahari Manganese Field, South Africa: description and crystal structure"] (in en). Mineralogical Magazine 58 (393): 663–670. doi:10.1180/minmag.1994.058.393.17. ISSN 0026-461X. Bibcode: 1994MinM...58..663G. https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/effenbergerite-bacusi4o10-a-new-mineral-from-the-kalahari-manganese-field-south-africa-description-and-crystal-structure/F0C433C47C392677A3B71F274ADDE936. 
  3. ↑ "Effenbergerite". https://www.mindat.org/min-6911.html. 
  4. ↑ 4.0 4.1 "Effenbergerite Mineral Data". http://webmineral.com/data/Effenbergerite.shtml. 

External links



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