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Effenbergerite

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Formula:
BaCu[Si
 
4
O
 
10
]
System:TetragonalColour:blue
Lustre:VitreousHardness: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

IMA status:Approved 1993
Strunz 8th edition ID:8/H.02-30
Nickel-Strunz 10th (pending) edition ID:9.EA.05

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
Dana 8th edition ID: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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Type Occurrence of Effenbergerite

Type Locality:Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese field, Northern Cape Province, South Africa
Year of Discovery:1993

Physical Properties of Effenbergerite

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

Crystallography of Effenbergerite

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:P4/ncc {P4/n 21/c 2/c}
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
Maximum Birefringence:δ = 0.040

Chart 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[Si
 
4
O
 
10
]
Simplified for copy/paste:BaCu[Si4O10]
Essential elements:Ba, Cu, O, Si
All elements listed in formula:Ba, Cu, O, Si

Relationship of Effenbergerite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EA.05Cuprorivaite
CaCu[Si
 
4
O
 
10
]
9.EA.05Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
9.EA.05Wesselsite
SrCu[Si
 
4
O
 
10
]
9.EA.10Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
9.EA.15Fluorapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
9.EA.15Hydroxyapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
9.EA.15Fluorapophyllite-(Na)
NaCa
 
4
(Si
 
8
O
 
20
)F · 8H
 
2
O
9.EA.20Magadiite
Na
 
2
Si
 
14
O
 
29
· 11H
 
2
O
9.EA.25Dalyite
K
 
2
ZrSi
 
6
O
 
15
9.EA.25Davanite
K
 
2
TiSi
 
6
O
 
15
9.EA.30Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
9.EA.30Sazhinite-(La)
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
9.EA.35Armstrongite
CaZr[Si
 
6
O
 
15
] · 3H
 
2
O
9.EA.40Okenite
CaSi
 
2
O
 
5
· 2H
 
2
O
9.EA.45Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
9.EA.50Cavansite
Ca(VO)Si
 
4
O
 
10
· 4H
 
2
O
9.EA.55Pentagonite
Ca(VO)Si
 
4
O
 
10
· 4H
 
2
O
9.EA.60Penkvilksite
Na
 
4
Ti
 
2
Si
 
8
O
 
22
· 4H
 
2
O
9.EA.60Tumchaite
Na
 
2
Zr(Si
 
4
O
 
11
) · 2H
 
2
O
9.EA.65Nabesite
Na
 
2
BeSi
 
4
O
 
10
· 4H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
AlSi
 
9
O
 
24
(OH)
 
6
· 3H
 
2
O
9.EA.75Zeravshanite
Na
 
2
Cs
 
4
Zr
 
3
[Si
 
18
O
 
45
]*2H
 
2
O
9.EA.80Bussyite-(Ce)
(Ce,REE)
 
3
(Na,H
 
2
O)
 
6
MnSi
 
9
Be
 
5
(O,OH)
 
30
F
 
4
9.EA.85Plumbophyllite
Pb
 
2
Si
 
4
O
 
10
· H
 
2
O

Other Names for Effenbergerite

Synonyms:
IMA1993-036
Other Languages:
German:Effenbergerit
Russian:Эффенбергерит
Spanish:Effenbergerita

Other Information

Health Warning: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

Search Engines:
  • Look for Effenbergerite on Google
  • Look for Effenbergerite images on Google
  • External Links:
  • Look for Effenbergerite on Webmineral
  • Look for Effenbergerite on Athena Mineralogy
  • Look for Effenbergerite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Buy fine minerals and gemstones from Pala International
  • Find Effenbergerite on www.crystalclassics.co.uk
  • Fine minerals from bisbeeborn.com
  • Buy from McDougall Minerals
  • Buy from David K Joyce minerals
  • Fine Minerals from Weinrich Minerals, Inc.
  • Fine and rare minerals from mintreasure.com
  • Wilensky Fine Minerals
  • Effenbergerite specimens for sale - minfind.com
  • Buy RARE Minerals from Rocks of Africa
  • Search for Effenbergerite on Well-Arranged Molecules
  • rare and unusual minerals mainly crystallized
  • Localities for Effenbergerite

    The 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. ? 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.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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