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Bavenite & Bazzite

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MCH161556

Bavenite & Bazzite

Rare Mineral

Description Tabs

Description
Locality: 
Heftetjern Pegmatite, Tørdal, Drangedal, Telemark, Norway
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 4 × 3.5 cm
Description

A 2.7 cm zone with an aggregate of numerous creamy-white, mostly fibrous bavenite crystals (XRD confirmed) is embedded in quartz.

In addition a sky-blue bazzite crystal, 0.4 cm in size, is located at the edge of the specimen. It is crossed by a small bavenite? crystal. At Heftetjern bazzite occurs as an accessory mineral within a cleavelandite-amazonite pegmatite. This locality is among the richest known occurences in the world for bazzite (also here it is occuring very rarely, however). Studies on different crystals showed a content of ca. 14.5 % of Sc2O3 and almost 3 weight % of Cs2O, Juve & Bergstøl, 1990). Therefore it is a caesian bazzite.

Specimen collected in 1995.

Mineral Data
What's on the rock

Bavenite

Formula: 
Ca4Be2Al2Si9O26(OH)2
Strunz: 
9.DF.25
Crystal System: 
Orthorhombic
Hardness: 
5.5
Colour: 
White
Type Locality: 
Seula mine (ex Montecatini quarry), Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy

Bazzite

Formula: 
Be3Sc2(Si6O18)
Strunz: 
9.CJ.05
Crystal System: 
Hexagonal
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Seula mine (ex Montecatini quarry), Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy

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