Avogadrite Mineral Data

Avogadrite Mineral Data +

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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.

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:

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Crystal Structure:

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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

Diaphaniety:

Transparent

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Vitreous - Greasy

Streak:

colorless

Optical Properties of Avogadrite

Gladstone-Dale:

CI meas= 0.166 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.264 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1092,KPDmeas= 0.1238,KC= 0.1484

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:

r_electron=2.42 gm/cc
note: r_Avogadrite=2.62 gm/cc.

Fermion Index

Fermion Index = 0.01442
Boson Index = 0.98558

Photoelectric:

PE_Avogadrite= 94.20 barns/electron
U=PE_Avogadrite x r_electron= 228.05 barns/cc.

Radioactivity:

GRapi = 261.75 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Avogadrite - barely detectable

Avogadrite Classification

Dana Class:

11.2.2.1 (11)Halide Complexes; Alumino-fluorides

(11.2)where (A)m B (X)4

(11.2.2)Dana Group

11.2.2.1 Avogadrite (K,Cs)BF4 P nma 2/m 2/m 2/m

Strunz Class:

III/B.01-20 III - Halogenides

III/B - Double halogenides without water, with [BF4]1-,[SiF6]2- and [AlF6]3-

III/B.01 - Ferruccite - Barberiite series

III/B.01-10 Ferruccite NaBF4 C mcm 2/m 2/m 2/m

III/B.01-20 Avogadrite (K,Cs)BF4 P nma 2/m 2/m 2/m

III/B.01-30 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Avogadrite

(K,Cs)BF4
Dana No: 11.2.2.1 Strunz No: III/B.01-20
Locality:

Notes: