Mineral Information and Data:

Barberiite
NH4BF4 [CNMNC approved formula]

Named for Franco Barberi, Italian volcanologist, University of Pisa, Italy.

IMA status : Approved Species 1994 (IMA1993-008)
CLASSIFICATION 
Dana
(8th edition) :
11.02.04.01  
  (11) Halide Complexes; Alumino-fluorides
  (11.02) where (A)m B (X)4
  (11.02.04)
  
Nickel-Strunz
(10th edition) :
03.CA.10
  (03) Halides
  (03.C) Complex Halides
  (03.CA) Borofluorides
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 9.0615Å, b = 5.6727Å, c = 7.2672Å
Crystal Habit: Crystals rare, pseudohexagonal, tabular to platy on {001}, typically elongated along [010] or [100], to 300 μm; commonly in globular aggregates, to 2 mm.
  
Color: Colorless
Diaphaneity: Transparent to translucent
Luster: Vitreous
Measured Density: 1.89(3) g/cm3
Streak: White
  
Geologic Setting: Formed by fumarolic activity, stable at ground temperatures between 200 °C and 600 °C.
Mineral Association: Malladrite, realgar, bismuthinite, cannizzarite, galenobismuthite, sphalerite, sulfur, sal ammoniac, sassolite
  
Other Properties: H2O Soluble.
Comments: Very soluble in H2O;
Decomposes in humid air.

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