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Avogadrite

A valid IMA mineral species - grandfathered
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About AvogadriteHide

04410040014946763911949.jpg
Lorenzo Romano Amedeo Carlo Avogadro di Quaregna (Quaregga) e di Cerreto
Formula:
(K,Cs)[BF4]
Colour:
Colourless to white, yellowish to reddish when impure, colourless in transmitted light
Specific Gravity:
2.9 (Calculated)
Crystal System:
Orthorhombic
Name:
For Amadeo Avogadro (Turin August 9 1776 - Turin, July 9 1856), Professor of Physics at the University of Turin, Turin, Italy. Remembered for Avogadro's gas law and Avogadro's number.
This page provides mineralogical data about Avogadrite.


Unique IdentifiersHide

Mindat ID:
438
Long-form identifier:
mindat:1:1:438:5
GUID
(UUID V4):
46734927-16a2-4cf8-9dca-a74fb64eb6e1

IMA Classification of AvogadriteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
KBF4

Classification of AvogadriteHide

3.CA.10

3 : HALIDES
C : Complex halides
A : Borofluorides
11.2.2.1

11 : HALIDE COMPLEXES
2 : AmBX4
8.12.2

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
12 : Fluorborates (BF'4) and fluosilicates (SiF''6)

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
AvgIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of AvogadriteHide

Transparency:
Translucent
Colour:
Colourless to white, yellowish to reddish when impure, colourless in transmitted light
Density:
2.9 g/cm3 (Calculated)

Optical Data of AvogadriteHide

Type:
Biaxial (-)
RI values:
nα = 1.324 nβ = 1.325 nγ = 1.325
2V:
Measured: 75° , Calculated: 58°
Max Birefringence:
δ = 0.001
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v, strong

Chemistry of AvogadriteHide

Mindat Formula:
(K,Cs)[BF4]

Crystallography of AvogadriteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 8.6588 Å, b = 5.48 Å, c = 7.0299 Å
Ratio:
a:b:c = 1.58 : 1 : 1.283
Unit Cell V:
333.57 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Octagonal crystals, tabular to platy on {001}, may be elongated along [010] or [100].

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0009363AvogadriteBrunton G (1969) The crystal structure of KBF4 Acta Crystallographica B25 2161-216219690293
0012154AvogadriteClark M J R, Lynton H (1969) Crystal structures of potassium, ammonium, rubidium and cesium tetrafluoroborates Canadian Journal of Chemistry 47 2579-25861969synthetic0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.41 Å(100)
3.26 Å(80)
3.06 Å(75)
2.068 Å(55)
3.51 Å(45)
2.801 Å(40)
2.091 Å(35)
Comments:
X-ray data of synthetic K[BF4] (ICDD 16-378)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
45b : [Other oxidized fumarolic minerals]
Geological Setting:
Volcanic fumaroles

Type Occurrence of AvogadriteHide

General Appearance of Type Material:
minute octagonal crystals and dense crusts
Place of Conservation of Type Material:
Natural History Museum, Paris, France (No. 126.148)
Geological Setting of Type Material:
Sublimation products around volcanic fumaroles
Associated Minerals at Type Locality:

Other Language Names for AvogadriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
6 photos of Avogadrite associated with MalladriteNa2[SiF6]
1 photo of Avogadrite associated with FerrucciteNa[BF4]
1 photo of Avogadrite associated with KnasibfiteK3Na4[SiF6]3[BF4]
1 photo of Avogadrite associated with VerneiteNa2Ca3Al2F14

Related Minerals - Strunz-mindat GroupingHide

3.CA.05FerrucciteNa[BF4]Orth. mmm (2/m 2/m 2/m) : Cmcm
3.CA.10Barberiite(NH4)[BF4]Orth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

Thermal Behaviour:
The mineral becomes cubic above 273°C.
Notes:
Slightly soluble in water.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for AvogadriteHide

References for AvogadriteHide

Localities for AvogadriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Campania
    • Naples
      • Somma-Vesuvius Complex
Palache et al. (1951)
Russo et al. (2004)
Palache et al. (1951) +2 other references
  • Sicily
    • Metropolitan City of Messina
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Gramaccioli et al. (2007)
Russia
 
Anthony (1997)
 
Mineral and/or Locality  
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