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Mineralpedia Details for Chiavennite

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Chiavennite

Chiavennite

Named for the type locality and only Italian locality at Tanno in Chiavenna, Lombardy. Additional localities for Chiavennite include in several localities in Norway, at the Uto mines in Sweden, and in Madagascar. Chivennite occurs in vugs in syenite pegmatite and as a coating on beryl in pegmatites. Additional associated minerals include bavenite, alancime, aegirine, helvite, eudidymite, natrolite, and feldspar.

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

Formula
CaMn2+(BeOH)2Si5O13ยท2H2
Crystal System
Orthorhombic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
yellow, orange, red orange 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
WebMineral
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Chiavennite from Vevja quarry, Tvedalen, Larvik, Vestfold, Norway

Chiavennite
            from Vevja quarry, Tvedalen, Larvik, Vestfold, Norway

Small piece with a thick coating of bright orange, micaceous micro crystals of Chiavennite, a rare Beryllium zeolite.

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Chiavennite from Tuften, Tvedalen, Larvik, Vestfold, Norway

Chiavennite
            from Tuften, Tvedalen, Larvik, Vestfold, Norway

Rusty orange tufts of Chiavennite composed of very this plates. The individual crystals can be seen in the fourth photo. Chiavennite is a rather rare beryllium mineral.

Click thumbnail images for larger view.

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