Barberiite
A valid IMA mineral species
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About Barberiite
Formula:
(NH4)[BF4]
Colour:
Colourless
Lustre:
Vitreous
Hardness:
1
Specific Gravity:
1.89
Crystal System:
Orthorhombic
Name:
For Franco Barberi (16 August 1938-), Professor of Volcanology, University of Pisa, Pisa, Italy, who promoted studies of Vulcano Island.
Formed by fumarolic activity, stable only at ground temperatures between 200 and 600°C. Decomposes in humid air.
In experimental sublimation (Mutnovsky volcano) a phase corresponding to barberiite i deposited below 180oC, together with As-bearing sulfur (Zelensky & Bortnikova, 2005).
In experimental sublimation (Mutnovsky volcano) a phase corresponding to barberiite i deposited below 180oC, together with As-bearing sulfur (Zelensky & Bortnikova, 2005).
Unique Identifiers
Mindat ID:
513
Long-form identifier:
mindat:1:1:513:5
GUID
(UUID V4):
(UUID V4):
d078401b-4082-43c7-a062-d011cd78b041
IMA Classification of Barberiite
Approved
IMA Formula:
(NH4)BF4
First published:
1994
Classification of Barberiite
3.CA.10
3 : HALIDES
C : Complex halides
A : Borofluorides
3 : HALIDES
C : Complex halides
A : Borofluorides
11.2.4.1
11 : HALIDE COMPLEXES
2 : AmBX4
11 : HALIDE COMPLEXES
2 : AmBX4
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Bbi | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Barberiite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless
Streak:
White
Hardness:
1 on Mohs scale
Hardness:
VHN25=14.2 kg/mm2 - Vickers
Density:
1.89 g/cm3 (Measured) 1.9 g/cm3 (Calculated)
Optical Data of Barberiite
Type:
Biaxial
RI values:
n = 1.3081
2V:
Measured: 90°
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v, strong
Chemistry of Barberiite
Mindat Formula:
(NH4)[BF4]
Elements listed:
Common Impurities:
K,Na
Crystallography of Barberiite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 9.0615 Å, b = 5.6727 Å, c = 7.2672 Å
Ratio:
a:b:c = 1.597 : 1 : 1.281
Unit Cell V:
373.56 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Commonly in globular aggregates; rarely as pseudohexagonal crystals, tabular to platy on {001}, typically elongated along [010] or [100]
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0019268 | Barberiite | Caron A P, Ragle J L (1971) Refinement of the structure of orthorhombic ammonium tetrafluoroborate, NH4BF4 Acta Crystallographica B27 1102-1107 | 1971 | synthetic | 0 | 293 | |
0012155 | Barberiite | Clark M J R, Lynton H (1969) Crystal structures of potassium, ammonium, rubidium and cesium tetrafluoroborates Canadian Journal of Chemistry 47 2579-2586 | 1969 | synthetic | 0 | 293 | |
0013299 | Barberiite | van Rensburg D J J, Boeyens J C A (1972) The crystal structure of ammonium tetrafluoroborate IV at 140 K Journal of Solid State Chemistry 5 79-84 | 1972 | synthetic | 0 | 293 | |
0018024 | Barberiite | Hoard J, Blair V (1935) The crystal structures of rubidium and ammonium fluoborates _cod_database_code 1011135 Journal of the American Chemical Society 57 1985-1988 | 1935 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.183 Å | (100) |
3.540 Å | (90) |
2.898 Å | (80) |
4.472 Å | (75) |
2.163 Å | (70) |
2.536 Å | (65) |
2.282 Å | (65) |
Comments:
Recorded on material from Vulcano Island, Italy
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
45b : [Other oxidized fumarolic minerals] | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
50 : Coal and/or oil shale minerals | <0.36 |
Stage 10b: Anthropogenic minerals | <10 Ka |
54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Barberiite
General Appearance of Type Material:
Globular aggregates to 2 mm, rarely as pseudohexagonal platy crystals to 300 µm
Place of Conservation of Type Material:
Bari University, Bari, Italy
Geological Setting of Type Material:
Sublimates in active fumaroles
Associated Minerals at Type Locality:
Reference:
Garavelli, A. and Vurro, F. (1994) Barberiite, NH4BF4, a new mineral from Vulcano, Aeolian Islands, Italy. American Mineralogist: 79: 381-384.
Synonyms of Barberiite
Other Language Names for Barberiite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
3.CA.05 | Ferruccite | Na[BF4] |
3.CA.10 | Avogadrite | (K,Cs)[BF4] |
Other Information
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 Barberiite
mindat.org URL:
https://www.mindat.org/min-513.html
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References for Barberiite
Localities for Barberiite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Germany | |
| EDX and XRD-analysed by Günter Blaß +1 other reference |
Italy (TL) | |
| Garavelli et al. (1994) |
Tajikistan | |
| Pavel.M. Kartashov (n.d.) |
Quick NavTopAbout BarberiiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
La Fossa crater, Vulcano Island, Lipari, Eolie Islands, Metropolitan City of Messina, Sicily, Italy