Mineral Information and Data:

Avogadrite
KBF4 [CNMNC approved formula]

Named for Amedeo Avogadro (1776-1856), Professor of Physics at the University of Turin, Turin, Italy.

IMA status : Valid species (Pre-IMA 1926) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
11.02.02.01  
  (11) Halide Complexes; Alumino-fluorides
  (11.02) where (A)m B (X)4
  (11.02.02)
  
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 = 8.6588Å, b = 5.48Å, c = 7.0299Å
Crystal Habit: As minute octagonal crystals, tabular to platy on {001}, may be elongated along [010] or [100]; as dense crusts.
  
Color: Colorless to white, yellowish to reddish when impure; colorless in transmitted light
Diaphaneity: Translucent
Measured Density: 2.507–3.305 (calculated) g/cm3
  
Polymorphism and Series: Cubic above 273 °C.
Geologic Setting: Formed as a sublimation product around volcanic fumaroles.
Mineral Association: Sassolite, malladrite, hieratite (Vesuvius, Italy)
  
Other Properties: H2O Soluble.
Comments: Taste bitter.

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