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Bavenite

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Formula:
Ca
 
4
Be
 
2
Al
 
2
Si
 
9
O
 
26
(OH)
 
2
System:OrthorhombicColour:White
Hardness:
Name:After the type locality of Baveno, Piedmont, Italy.

Classification of Bavenite

IMA status:Approved
Strunz 8th edition ID:8/G.07-10
Nickel-Strunz 10th (pending) edition ID:9.DF.25

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
Dana 8th edition ID:70.5.3.1

70 : INOSILICATES Column or Tube Structures
5 : Column or Tube Structures with chains linked by Be
Hey's CIM Ref.:16.6.3

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

Type Locality:Seula mine (ex Montecatini quarry), Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
Year of Discovery:1901

Physical Properties of Bavenite

Colour:White
Hardness (Mohs):

Crystallography of Bavenite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Cmcm {C2/m 2/c 21/m}
Cell Parameters:a = 19.39Å, b = 23.19Å, c = 5Å
Ratio:a:b:c = 0.836 : 1 : 0.216
Unit Cell Volume:V 2,248.27 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
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°
Maximum Birefringence:δ = 0.005 - 0.007

Chart 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:
Ca
 
4
Be
 
2
Al
 
2
Si
 
9
O
 
26
(OH)
 
2
Simplified for copy/paste:Ca4Be2Al2Si9O26(OH)2
Essential elements:Al, Be, Ca, H, O, Si
All elements listed in formula:Al, Be, Ca, H, O, Si

Relationship of Bavenite to other Species

Series:Forms a series with Bohseite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
9.DF.05Chesterite
(Mg,Fe)
 
17
Si
 
20
O
 
54
(OH)
 
6
9.DF.05Clinojimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
9.DF.05Jimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
9.DF.15Ershovite
Na
 
4
K
 
3
(Fe,Mn,Ti)
 
2
Si
 
8
O
 
22
(OH)
 
4
· 4H
 
2
O
9.DF.15Paraershovite
Na
 
3
K
 
3
Fe
3+
2
Si
 
8
O
 
20
(OH)
 
4
· 4H
 
2
O
9.DF.20Tvedalite
(Ca,Mn)
 
4
Be
 
3
Si
 
6
O
 
17
(OH)
 
4
· 3H
 
2
O
9.DF.30Bigcreekite
BaSi
 
2
O
 
5
· 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
16.6.1Beryl
Be
 
3
Al
 
2
(Si
 
6
O
 
18
)
16.6.2Euclase
BeAl(SiO
 
4
)(OH)
16.6.4Aminoffite
Ca
 
2
(Be,Al)(Si
 
2
O
 
7
)(H
 
2
O,OH)
16.6.5Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
· H
 
2
O
16.6.6Lovdarite
(Na,K,Ca)
 
4
(Be,Al)
 
2
Si
 
6
O
 
16
· 4H
 
2
O
16.6.7Surinamite
(Mg,Fe)
 
3
Al
 
4
BeSi
 
3
O
 
16
16.6.8Ferrotaaffeite-6N'3S
(Be,Zn,Mg)FeAl
 
4
O
 
8

Other Names for Bavenite

Synonyms:
Pilinite
Other Languages:
German:Bavenit
Russian:Бавенит
Simplified Chinese:硬羟钙铍石
Spanish:Bavenita

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 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

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  • Raman and XRD data at RRUFF project
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  • Bavenite details from Handbook of Mineralogy (PDF)
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