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Allanite

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WND590927

Allanite

Description Tabs

Description
Locality: 
Barbudalen, Arendal, Agder, Norway
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
10.3 × 3.5 × 2.3 cm
Largest Crystal: 
10.30cm
Description

This is an enormous cluster of allanite. It is distinctive striated and has a deep raven-black colour. An interesting piece from the Norwegian locality Barbudalen in Aust-Agder.

Mineral Data
What's on the rock

Allanite

Synonym Of: 

Allanite-(Ce)

Formula: 
{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05b
Hardness: 
5.5 - 6.0

Allanite-(La)

Formula: 
{CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05b
Hardness: 
6.0

Allanite-(Y)

Formula: 
{CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05b
Hardness: 
5.5 - 6.5
Wendel Minerals

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