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Mineralpedia Details for Bavenite

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Bavenite

Bavenite

Named for the type locality at Baveno in the Seula mine in Piedmont, Italy. Bavenite is an uncommon mineral that occurs “as druses in miarolitic cavities in granite and associated pegmatites, formed by the alteration of beryl and other beryllium-bearing minerals, [and] also in hydrothermal veins and skarn.” Localities include in, additionally, the Czech Republic, Norway, Switzerland, the United States, Australia, Kazakhstan, Russia, and a number of others. Bavenite is weakly piezoelectric and generates a charge in response to pressure.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/bavenite.pdf

Formula
Ca4Be2Al2Si9O26(OH)2 
Crystal System
Orthorhombic 
Crystal Habit
Lamellar, Massive - Lamellar, Radial 
Cleavage
Perfect, Fair, None 
Luster
Vitreous - Pearly 
Color
white, green, pink, brown 
Streak
white 
Class
Orthorhombic - Pyramidal 
Fracture
Uneven 
Hardness
5.5 
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Bavenite from Ermakovka deposit, Transbaikalia, Russia

Bavenite
            from Ermakovka deposit, Transbaikalia, Russia

Compact white, thin bladed, divergent to radial crystal aggregates to 1cm with Fluorite.

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Bavenite from Foote mine, Cleveland Co., North Carolina, United States

Bavenite
            from Foote mine, Cleveland Co., North Carolina, United States

Bavenite is chiefly a pegmatitic mineral mostly because this is where the most beryllium minerals are found. Although it is also found in skarns and hydrothermal veins. This specimen contains numerous snow white sprays of bladed Bavenite crystals to 1mm scattered amongst Albite crystals and what I believe to be Switzerite (golden brown).

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Bavenite from Londonderry Lithium deposit, Western Australia, Australia

Bavenite
            from Londonderry Lithium deposit, Western Australia, Australia

Pearly thin plates radiating along cleavelandite Albite fractures.

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