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 % Al2 O3
Silicon 27.75 % Si 59.36 % SiO2
Hydrogen 0.22 % H 1.93 % H2 O
Oxygen 48.11 % O
______ ______
100.00 % 100.34 % = TOTAL OXIDE
Empirical Formula:
Ca4.1 Be2.9 Al1.2 Si9.2 O26 (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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEBavenite = 3.36 barns/electronU=PEBavenite x r Electron 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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Bavenite
Ca4Be2Al2Si9O26(OH)2
Dana No: 70.05.03.01 Strunz No: 09.DF.25
Locality:
Notes:
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