Barberiite (original) (raw)

A valid IMA mineral species

About BarberiiteHide

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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).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:513:5

d078401b-4082-43c7-a062-d011cd78b041

IMA Classification of BarberiiteHide

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Type description reference:

Classification of BarberiiteHide

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3.CA.10

3 : HALIDES
C : Complex halides
A : Borofluorides

11.2.4.1

11 : HALIDE COMPLEXES
2 : AmBX4

Mineral SymbolsHide

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

Physical Properties of BarberiiteHide

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Transparency:

Transparent, Translucent

Hardness:

VHN25=14.2 kg/mm2 - Vickers

Density:

1.89 g/cm3 (Measured) 1.9 g/cm3 (Calculated)

Optical Data of BarberiiteHide

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δ = 0.000

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of BarberiiteHide

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Mindat Formula:

(NH4)[BF4]

Crystallography of BarberiiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

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)

Morphology:

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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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 DiffractionHide

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Powder Diffraction Data:

Comments:

Recorded on material from Vulcano Island, Italy

Geological EnvironmentHide

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Type Occurrence of BarberiiteHide

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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 BarberiiteHide

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Other Language Names for BarberiiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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 BarberiiteHide

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References for BarberiiteHide

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Localities for BarberiiteHide

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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

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- 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.