Mineral Information and Data:

Bavenite
Ca4Be2Al2Si9O26(OH)2 [CNMNC approved formula]

Named in 1901 after its locality: Baveno, Lago Maggiore, Piedmont, Italy.

IMA status : Approved Species 1962 ()
CLASSIFICATION 
Dana
(8th edition) :
70.05.03.01  
  (70) Inosilicate Column or Tube Structures
  (70.05) with chains linked by Be
  (70.05.03)
  
Nickel-Strunz
(10th edition) :
09.DF.25
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DF) with 2-periodic multiple chains
  
Crystal system: Orthorhombic System
Point group (H-M): mm2 — pyramidal
Space group: Am2a
Unit cell: a = 19.39Å, b = 23.19Å, c = 5Å
Crystal Habit: As radiating crystal groups, to 6 cm; as bladed crystals and rosettes of thin plates; also fine felt-like masses of needles, compact fibrous, chalklike massive.
Twinning: On {100}
  
Color: Colorless to white
Diaphaneity: Translucent to transparent
Luster: Vitreous
Hardness (Mohs): 5.5 - 6
Measured Density: 2.71 - 2.74 g/cm3
Cleavage: Perfect on {001}, fair on {100}
  
Geologic Setting: As druses in miarolitic cavities in granite and associated pegmatites, formed by alteration of beryl and other beryllium-bearing minerals. Also in hydrothermal veins and skarns.
Mineral Association: Beryl, helvite, phenakite, bertrandite, quartz, epidote, stilbite, albite, orthoclase, titanite, chlorite, clinozoisite, tremolite
  
Other Properties: Piezoelectric.
Comments: Weakly piezoelectric.

<<< BACK TO MINERAL SEARCH