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 | |
|---|---|
| Category | Mineral |
| Formula (repeating unit) | BaCuSi4O10 |
| Strunz classification | 09.EA.05 |
| Dana classification | 71.02.03.03 |
| Crystal system | tetragonal |
| Crystal class | P4/ncc |
| Structure | |
| Identification | |
| Formula mass | 473.21 |
| Colour | blue |
| Luster | vitreous |
| Streak | pale blue |
| Diaphaneity | transparent |
| Density | 3.57 - 3.52 |
| Optical properties | Uniaxial (-) |
| Refractive index | e=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 edit
- ^ "The Kalahari Manganese Fields | Cape Minerals". www.capeminerals.co.za.
- ^ Giester, G.; Rieck, B. (December 1994). "Effenbergerite, BaCu[Si4O10], a new mineral from the Kalahari Manganese Field, South Africa: description and crystal structure". Mineralogical Magazine. 58 (393): 663–670. Bibcode:1994MinM...58..663G. doi:10.1180/minmag.1994.058.393.17. ISSN 0026-461X. S2CID 56047566.
- ^ "Effenbergerite". www.mindat.org.
- ^ a b "Effenbergerite Mineral Data". webmineral.com.