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Barberiite

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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).


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Classification of BarberiiteHide

Approved
3.CA.10

3 : HALIDES
C : Complex halides
A : Borofluorides
11.2.4.1

11 : HALIDE COMPLEXES
2 : AmBX4

Physical Properties of BarberiiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless
Streak:
White
Hardness:
Hardness:
VHN25=14.2 kg/mm2 - Vickers
Density:
1.89 g/cm3 (Measured)    1.9 g/cm3 (Calculated)

Optical Data of BarberiiteHide

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.
Surface Relief:
Moderate
Dispersion:
r > v, strong

Chemical Properties of BarberiiteHide

Formula:
(NH4)[BF4]
IMA Formula:
NH4BF4
Common Impurities:
K,Na

Crystallography of BarberiiteHide

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]

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.183 (100)
3.540 (90)
2.898 (80)
4.472 (75)
2.163 (70)
2.536 (65)
2.282 (65)
Comments:
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:

Synonyms of BarberiiteHide

Other Language Names for BarberiiteHide

Related Minerals - Nickel-Strunz GroupingHide

3.CA.05FerrucciteNa[BF4]Orth.
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.
Germany
 
  • North Rhine-Westphalia
    • 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. (1997): Barberiite, NH4BF4, a new mineral from Vulcano, Aeolian Islands, Italy. - American Mineralogist - 79, 381-384.
Tajikistan
 
  • Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad)
    • Zeravshan Range
      • Yagnob River
Pavel M. Kartashov analytical data
Mineral and/or Locality  
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