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About BarberiiteHide

Specific Gravity:
Crystal System:
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).

Classification of BarberiiteHide

First Published:

C : Complex halides
A : Borofluorides

2 : AmBX4

Physical Properties of BarberiiteHide

Transparent, Translucent
VHN25=14.2 kg/mm2 - Vickers
1.89 g/cm3 (Measured)    1.9 g/cm3 (Calculated)

Optical Data of BarberiiteHide

RI values:
n = 1.3081
Measured: 90°
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r > v, strong

Chemical Properties of BarberiiteHide

IMA Formula:
Emperical Formula (of original material):
Common Impurities:

Crystallography of BarberiiteHide

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cell Parameters:
a = 9.0615 Å, b = 5.6727 Å, c = 7.2672 Å
a:b:c = 1.597 : 1 : 1.281
Unit Cell V:
373.56 ų (Calculated from Unit Cell)
Commonly in globular aggregates; rarely as pseudohexagonal crystals, tabular to platy on {001}, typically elongated along [010] or [100]

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0019268BarberiiteCaron A P, Ragle J L (1971) Refinement of the structure of orthorhombic ammonium tetrafluoroborate, NH4BF4 Acta Crystallographica B27 1102-11071971synthetic0293
0012155BarberiiteClark M J R, Lynton H (1969) Crystal structures of potassium, ammonium, rubidium and cesium tetrafluoroborates Canadian Journal of Chemistry 47 2579-25861969synthetic0293
0013299Barberiitevan 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 79-841972synthetic0293
0018024BarberiiteHoard J, Blair V (1935) The crystal structures of rubidium and ammonium fluoborates _cod_database_code 1011135 Journal of the American Chemical Society 57 1985-198819350293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
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)
Recorded on material from Vulcano Island, Italy

Type Occurrence of BarberiiteHide

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:
Garavelli, A. and Vurro, F. (1994) Barberiite, NH4BF4, a new mineral from Vulcano, Aeolian Islands, Italy. American Mineralogist: 79: 381-384.

Synonyms of BarberiiteHide

Other Language Names for BarberiiteHide

Related Minerals - Nickel-Strunz GroupingHide

3.CA.10Avogadrite(K,Cs)[BF4]Orth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BarberiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Caron, A.P. and Ragle, J.L. (1971) Refinement of the structure of orthorhombic ammonium tetrafluoroborate, NH4BF4. Acta Crystallographica: 27: 1102-1107.
Garavelli, A. and Vurro, F. (1994) Barberiite, NH4BF4, a new mineral from Vulcano, Aeolian Islands, Italy. American Mineralogist: 79: 381-384.
Anthony, J.W., et al. (1997) Handbook of Mineralogy, Vol. 3: 38.
Zelensky, M., Bortnikova, S. (2005) Sublimate speciation at Mutnovsky volcano, Kamchatka. European Journal of Mineralogy: 17: 107-118.

Internet Links for BarberiiteHide

Localities for BarberiiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • North Rhine-Westphalia
    • Cologne
      • Aachen
        • Alsdorf
EDX and XRD-analysed by Günter Blaß ; matches PDF 47-1762 (and the former PDF 15-745); Witzke, T., de Wit, F., Kolitsch, U. and Blaß, G. (2015): Mineralogy of the Burning Anna I Coal Mine Dump, Alsdorf, Germany. Chapter 7, pp. 203-240, in: Stracher, G. B., Prakash, A. and Sokol, E. V.: Coal and Peat Fires: A Global Perspective, Volume 3: Case Studies - Coal Fires, Elsevier, 786 pp.
Italy (TL)
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Garavelli, A., Vurro, F. (1994) Barberiite, NH4BF4, a new mineral from Vulcano, Aeolian Islands, Italy. American Mineralogist: 79: 381-384.
  • Sughd
    • Zeravshan Range
      • Yagnob River
Pavel M. Kartashov analytical data
Mineral and/or Locality  
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