Avogadrite Mineral Data

[Mineral Forums] [Minerals for Sale] [About Us] [En Espanol] [Mineral Gallery]
Fabre Minerals - Europe's first Internet mineral dealer, on the web since 1996

General Avogadrite Information

Chemical Formula:

(K,Cs)BF4

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

Empirical Formula:

K_0.75Cs_0.25BF₄

Environment:

Sublimate from volcanic fumaroles.

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

Vesuvius, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Amedeo Avogadro (1776-1856), Professor of Physics at the University of Turin, Turin, Italy.

Name Pronunciation:

Avogadrite + Pronunciation

Synonym:

ICSD 9875

PDF 16-378

Avogadrite Image

Images:

Avogadrite Ferruccite

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

Images:

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

Images:

Avogadrite Malladrite

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

Axial Ratios:

a:b:c =1.581:1:1.2824

Cell Dimensions:

a = 8.664, b = 5.48, c = 7.028, Z = 4; V = 333.68 Den(Calc)= 2.97

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 3.41(1), 3.26(0.8), 3.06(0.75),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Brunton G , Acta Crystallographica, Section B , 25 (1969) p.2161-2162, The crystal structure of KBF4

Physical Properties of Avogadrite

Color:

Colorless, White, Yellowish, Reddish.

Density:

2.62

Diaphaneity:

Transparent

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Vitreous - Greasy

Streak:

colorless

Optical Properties of Avogadrite

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

Electron Density:

Bulk Density (Electron Density)=2.74 gm/cc
note: Specific Gravity of Avogadrite =2.97 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Avogadrite= 94.20 barns/electron
U=PE_Avogadrite x r_electron= 258.51 barns/cc.

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

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

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

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Avogadrite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Avogadrite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Avogadrite Mineral Data :

Ask about Avogadrite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Avogadrite

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

Notes: