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Barberiite

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Formula:
(NH4)[BF4]
System:
Orthorhombic
Colour:
Colourless
Lustre:
Vitreous
Hardness:
1
Name:
For Franco Barberi, 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.

Classification of Barberiite

Approved
3.CA.10

3 : HALIDES
C : Complex halides
A : Borofluorides
11.2.4.1

11 : HALIDE COMPLEXES
2 : AmBX4
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First Recorded Occurrence of Barberiite

General Appearance of First Recorded Material:
Globular aggregates to 2 mm, rarely as pseudohexagonal platy crystals to 300 µm
Place of Conservation of First Recorded Material:
Bari University, Bari, Italy
Year of Discovery:
1994
Geological Setting of First Recorded Material:
Sublimates in active fumaroles

Physical Properties of Barberiite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless
Streak:
White
Hardness (Mohs):
1
Hardness (Vickers):
VHN25=14.2 kg/mm2
Density:
1.89 g/cm3 (Measured)    1.9 g/cm3 (Calculated)

Crystallography of Barberiite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 9.0615Å, b = 5.6727Å, c = 7.2672Å
Ratio:
a:b:c = 1.597 : 1 : 1.281
Unit Cell Volume:
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 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

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

Chemical Properties of Barberiite

Formula:
(NH4)[BF4]
Essential elements:
All elements listed in formula:
Analytical Data:
Analysis of material from Vulcano Island, Italy, by ion exchange chromatography; empirical formula calculated after deduction of some NH4, F, Cl and Br as sal ammoniac.
Na (0.4)
K (2.2)
NH4 (16.6)
BF4 (79.8)
F (0.3)
Cl (0.6)
Br (0.1)

sum 100.0 wt.-%
Empirical Formula:
[(NH4)0.96K0.06Na0.02]=1.04BF4
Common Impurities:
K,Na

Relationship of Barberiite to other Species

Other Names for Barberiite

Name in Other Languages:

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.

References for Barberiite

Reference List:
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.

Internet Links for Barberiite

Localities for Barberiite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • North Rhine-Westphalia
    • Aachen
      • Alsdorf
EDX and XRD-analysed by Günter Blaß ; matches PDF 47-1762 (and the former PDF 15-745)
Italy
 
  • 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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