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Halloysite & Dravite

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TPX769859

Halloysite & Dravite

Rare Mineral

Description Tabs

Description
Locality: 
Bjordam Quarry, Bjordam, Bamble, Vestfold og Telemark, Norway
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.8 × 4.5 × 3 cm
Weight: 
47.00gr
Description

Very interesting specimen of red halloysite and brown dravite on matrix from this classic Norwegian site.

Mineral Data
What's on the rock

Halloysite

Group Parent: 
Kaolinite-Serpentine Group

Dravite

Formula: 
Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Crystal System: 
Trigonal
Hardness: 
7.0
Type Locality: 
Dobrova, Dravograd (Unterdrauburg), Slovenia

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