Mineralogy Database

Avogadrite Mineral Data

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General Avogadrite Information

Help on Chemical  Formula: Chemical Formula: (K,Cs)BF4
Help on Composition: Composition: Molecular Weight = 149.35 gm
   Cesium     22.25 %  Cs   23.59 % Cs2O
   Potassium  19.63 %  K    23.65 % K2O
   Boron       7.24 %  B    23.31 % B2O3
   Fluorine   50.88 %  F    50.88 % F
                -   %   F   -21.42 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.75Cs0.25BF4
Help on Environment: Environment: Sublimate from volcanic fumaroles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1926
Help on Locality: Locality: Vesuvius, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Amedeo Avogadro (1776-1856), Professor of Physics at the University of Turin, Turin, Italy.
Help on Name Pronunciation: Name Pronunciation: Avogadrite + Pronunciation Say AVOGADRITE
Help on Synonym: Synonym: ICSD 9875
  PDF 16-378
 

Avogadrite Image

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  Ferruccite   Avogadrite

Comments: Very small, white crystals of ferrite on massive, yellowish avogadrite.
Location: Vesuvius, Naples, Naples province, Campania, Italy. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

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  Avogadrite   Malladrite

Comments: Botryoidal pinkish-white avogadrite with yellow malladrite.
Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Malladrite   Avogadrite

Comments: Yellow-orange crystalline malladrite with pinkish white avogadrite.
Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Avogadrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.581:1:1.2824
Help on Cell Dimensions: Cell Dimensions: a = 8.664, b = 5.48, c = 7.028, Z = 4; V = 333.68 Den(Calc)= 2.97
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.41(1), 3.26(0.8), 3.06(0.75),
Help on Forms: Forms:

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Help on Above

Forms: ( 1 0 1) ( 2 1 1) ( 0 1 1) ( 2 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Avogadrite

Help on Color: Color: Colorless, White, Yellowish, Reddish.
Help on Density: Density: 2.62
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: colorless
 

Optical Properties of Avogadrite

Help on Optical Data: Optical Data: Biaxial (-), a=1.3239, b=1.3245, g=1.3247, bire=0.0008, 2V(Calc)=58, 2V(Meas)=75.
 

Calculated Properties of Avogadrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.74 gm/cc
note: Specific Gravity of Avogadrite =2.97 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAvogadrite = 94.20 barns/electron
U=PEAvogadrite x relectron= 258.51 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 261.75 (Gamma Ray American Petroleum Institute Units)
Concentration of Avogadrite per GRapi unit = 0.38 (%)

Estimated Radioactivity from Avogadrite - barely detectable

 

Avogadrite Classification

Help on  Dana Class: Dana Class: 11.02.02.01 (11)Halide Complexes; Alumino-fluorides
  (11.02)where (A)m B (X)4
  (11.02.02)Dana Group
 
11.02.02.01 Avogadrite (K,Cs)BF4 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.CA.10 03 - HALIDES
  03.C - Complex Halides
  03.CA -Borofluorides
 
03.CA.10 Avogadrite (K,Cs)BF4 P nma 2/m 2/m 2/m
 
03.CA.10 Barberiite (NH4)BF4 P nma 2/m 2/m 2/m
 

Other Avogadrite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Avogadrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Avogadrite

(K,Cs)BF4
Dana No: 11.02.02.01 Strunz No: 03.CA.10
Locality:

 

Notes:

 

 
   
 


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