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Effenbergerite

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Prof. Herta Effenberger
Formula:
BaCu[Si4O10]
System:
Tetragonal
Colour:
blue
Lustre:
Vitreous
Hardness:
4 - 5
Name:
Named after Prof. Dr. Herta S. Effenberger, mineralogist and crystallographer of the University of Vienna.
This page provides mineralogical data about Effenbergerite.

Classification of Effenbergerite

Approved 1993
9.EA.05

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
71.2.3.3

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
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http://www.mindat.org/min-6911.html
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First Recorded Occurrence of Effenbergerite

Year of Discovery:
1993

Physical Properties of Effenbergerite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
blue
Streak:
light blue
Hardness (Mohs):
4 - 5
Cleavage:
Perfect
parallel to {001}
Fracture:
Sub-Conchoidal
Density:
3.51 - 3.57 g/cm3 (Measured)    3.52 g/cm3 (Calculated)

Crystallography of Effenbergerite

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P4/ncc
Cell Parameters:
a = 7.44Å, c = 16.13Å
Ratio:
a:c = 1 : 2.168
Unit Cell Volume:
V 892.85 ų (Calculated from Unit Cell)

Optical Data of Effenbergerite

Type:
Uniaxial (-)
RI values:
nω = 1.633 nε = 1.593
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Strong
Comments:
dark blue in O and pale blue to nearly colorless in E

Chemical Properties of Effenbergerite

Formula:
BaCu[Si4O10]
Essential elements:
All elements listed in formula:

Relationship of Effenbergerite to other Species

9.EA.05CuprorivaiteCaCu[Si4O10]
9.EA.05GillespiteBaFe2+[Si4O10]
9.EA.05WesselsiteSrCu[Si4O10]
9.EA.10Ekanite(Ca,Fe2+,Pb)2(Th,U)[Si8O20]
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2O
9.EA.20MagadiiteNa2Si14O29 · 11H2O
9.EA.25DalyiteK2ZrSi6O15
9.EA.25DavaniteK2TiSi6O15
9.EA.30Sazhinite-(Ce)Na3Ce[Si6O15] · 6H2O
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2O
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2O
9.EA.40OkeniteCaSi2O5 · 2H2O
9.EA.45NekoiteCa3Si6O15·7H2O
9.EA.50CavansiteCa(VO)Si4O10 · 4H2O
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2O
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2O
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2O
9.EA.65NabesiteNa2BeSi4O10 · 4H2O
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2O
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2O
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4
9.EA.85PlumbophyllitePb2Si4O10 · H2O

Other Names for Effenbergerite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Effenbergerite

Reference List:
New Minerals (1997), New Minerals 1990-1994.

Mineralogical Magazine: 58: 663-670.

Knight, K. S.; Henderson, C. M. B.; Clark, S. M. (2010): Structural variations in the wesselsite-effenbergerite (Sr1xBaxCuSi4O10) solid solution. European Journal of Mineralogy 22, 411-423.

Internet Links for Effenbergerite

Localities for Effenbergerite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
Giester, G., & Rieck, B. (1994). Effenbergerite BaCu [Si4010], a new mineral from the Kalahari manganese field, South Africa: description and crystal structure. Mineralogical Magazine, 58, 663-670.
Mineral and/or Locality  
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