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Bavenite

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Formula:
Ca4Be2Al2Si9O26(OH)2
System:
Orthorhombic
Colour:
White
Hardness:
Name:
After the type locality of Baveno, Piedmont, Italy.

Classification of Bavenite

Approved
9.DF.25

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
70.5.3.1

70 : INOSILICATES Column or Tube Structures
5 : Column or Tube Structures with chains linked by Be
16.6.3

16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be
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Type Occurrence of Bavenite

Year of Discovery:
1901

Physical Properties of Bavenite

Colour:
White
Hardness (Mohs):

Crystallography of Bavenite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 19.39(2) Å, b = 23.19(2) Å, c = 5.005(9) Å
Ratio:
a:b:c = 0.836 : 1 : 0.216
Unit Cell Volume:
V 2,250.52 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space group Am2a (non-standard setting).
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Bavenite

Type:
Biaxial (+)
RI values:
nα = 1.578 - 1.586 nβ = 1.579 - 1.586 nγ = 1.583 - 1.593
2V:
Measured: 22° to 60°
Max Birefringence:
δ = 0.005 - 0.007
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v moderate

Chemical Properties of Bavenite

Formula:
Ca4Be2Al2Si9O26(OH)2
Essential elements:
All elements listed in formula:

Relationship of Bavenite to other Species

Series:
Forms a series with Bohseite (see here)
9.DF.05Chesterite(Mg,Fe)17Si20O54(OH)6
9.DF.05Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2
9.DF.05Jimthompsonite(Mg,Fe)5Si6O16(OH)2
9.DF.15ErshoviteNa4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2O
9.DF.15ParaershoviteNa3K3Fe23+Si8O20(OH)4 · 4H2O
9.DF.20Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
9.DF.30BigcreekiteBaSi2O5 · 4H2O
16.6.1BerylBe3Al2(Si6O18)
16.6.2EuclaseBeAl(SiO4)(OH)
16.6.4AminoffiteCa2(Be,Al)(Si2O7)(H2O,OH)
16.6.5MilariteK2Ca4Al2Be4Si24O60 · H2O
16.6.6LovdariteK2Na6Be4Si14O36 · 9H2O
16.6.7Surinamite(Mg,Fe)3Al4BeSi3O16
16.6.8Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8

Other Names for Bavenite

Name in Other Languages:
German:Bavenit
Simplified Chinese:硬羟钙铍石
Spanish:Bavenita

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 Bavenite

Reference List:
Schaller, Waldemar Theodore & John Gifford Fairchild (1932), Bavenite, a beryllium mineral, pseudomorphous after beryl, from California: American Mineralogist: 17: 409-422; American Mineralogist: 17: 114 (1932).

Acta Crystallographica: 20: 301-309.

Armstrong, J.A., Friis, H., Lieb, A., Finch, A.A., Weller, M.T. (2010): Combined single-crystal X-ray and neutron powder diffraction structure analysis exemplified through full structure determinations of framework and layer beryllate minerals. American Mineralogist, 95, 519-526.

A. J. Lussier and F. C. Hawthorne (2011): Short-range constraints on chemical and structural variations in bavenite. Mineral. Mag. 75, 213-239.

Internet Links for Bavenite

Specimens:
The following Bavenite specimens are currently listed for sale on minfind.com.

Localities for Bavenite

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.
Mineral and/or Locality  
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