Mineralogy Database

Bavenite Mineral Data

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General Bavenite Information

Help on Chemical  Formula: Chemical Formula: Ca4Be2Al2Si9O26(OH)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca4.1Be2.9Al1.2Si9.2O26(OH)2
Help on Environment: Environment: Pegmatitic druses in granite formed from the alteration of beryllium-bearing minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1901
Help on Locality: Locality: Baveno, Lago Maggiore, Piedmont, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Bavenite Say BAVENITE
Help on Synonym: Synonym: ICSD 28093
  PDF 915-535

Bavenite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.8361:1:0.2158
Help on Cell Dimensions: Cell Dimensions: a = 19.39, b = 23.19, c = 5.005, Z = 4; V = 2,250.52 Den(Calc)= 2.75
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Am2a
Help on X Ray Diffraction: 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

Help on Cleavage: Cleavage: {001} Perfect, {100} Fair
Help on Color: Color: White, Green, Pink, Brown.
Help on Density: Density: 2.7
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Bavenite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.74 gm/cc
note: Specific Gravity of Bavenite =2.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEBavenite = 3.36 barns/electron
U=PEBavenite x rElectron Density= 9.22 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bavenite is Not Radioactive

Bavenite Classification

Help on  Dana Class: Dana Class: (70)Inosilicate Column or Tube Structures
  (70.05)with chains linked by Be
  (70.05.03)Dana Group Bavenite Ca4Be2Al2Si9O26(OH)2 Am2a mm2
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: 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

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Dana No: Strunz No: 09.DF.25





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