Bavenite Mineral Data

General Bavenite Information

Chemical Formula:

Ca4Be2Al2Si9O26(OH)2

Composition:

Molecular Weight = 931.22 gm

Calcium 17.65 % Ca 24.69 % CaO

Beryllium 2.81 % Be 7.79 % BeO

Aluminum 3.48 % Al 6.57 % Al₂O₃

Silicon 27.75 % Si 59.36 % SiO₂

Hydrogen 0.22 % H 1.93 % H₂O

Oxygen 48.11 % O

______ ______

100.00 % 100.34 % = TOTAL OXIDE

Empirical Formula:

Ca_4.1Be_2.9Al_1.2Si_9.2O₂₆(OH)₂

Environment:

Pegmatitic druses in granite formed from the alteration of beryllium-bearing minerals.

IMA Status:

Valid Species (Pre-IMA) 1901

Locality:

Baveno, Lago Maggiore, Piedmont, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Bavenite

Synonym:

ICSD 28093

PDF 915-535

Bavenite Image

Images:

Bavenite

Comments: Clear, acicular bavenite crystals.
Location: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Bavenite Crystallography

Axial Ratios:

a:b:c =0.8361:1:0.2158

Cell Dimensions:

a = 19.39, b = 23.19, c = 5.005, Z = 4; V = 2,250.52 Den(Calc)= 2.75

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Am2a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.74(1), 3.35(0.9), 3.24(0.8),3.05(0.7), 3.13(0.7), 2.56(0.6), 4.19(0.5),

Physical Properties of Bavenite

Cleavage:

{001} Perfect, {100} Fair

Color:

White, Green, Pink, Brown.

Density:

2.7

Diaphaneity:

Transparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Massive - Lamellar - Distinctly foliated fine-grained forms.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5.5 - Knife Blade

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Bavenite

Gladstone-Dale:

CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2124,KPDmeas= 0.2164,KC= 0.2142
Ncalc = 1.58 - 1.59

Optical Data:

Biaxial (+), a=1.578-1.586, b=1.579-1.586, g=1.583-1.593, bire=0.0050-0.0070, 2V(Calc)=0-54, 2V(Meas)=22-60.

Calculated Properties of Bavenite

Electron Density:

Bulk Density (Electron Density)=2.74 gm/cc
note: Specific Gravity of Bavenite =2.75 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Bavenite= 3.36 barns/electron
U=PE_Bavenite x rElectron Density= 9.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bavenite is Not Radioactive

Bavenite Classification

Dana Class:

70.05.03.01 (70)Inosilicate Column or Tube Structures

(70.05)with chains linked by Be

(70.05.03)Dana Group

70.05.03.01 Bavenite Ca4Be2Al2Si9O26(OH)2 Am2a mm2

Strunz Class:

09.DF.25 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DF -Inosilicates with 2-periodic multiple chains

09.DF.25 Bavenite Ca4Be2Al2Si9O26(OH)2 Am2a mm2

Other Bavenite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Bavenite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Print or Cut-and-Paste your Bavenite Specimen Label here :

Bavenite

Ca4Be2Al2Si9O26(OH)2
Dana No: 70.05.03.01 Strunz No: 09.DF.25
Locality:

Notes:

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