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Allanite

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PDM597729

Allanite

With Antique Label

Description Tabs

Description
Locality: 
Ambatondrazaka, Alaotra-Mangoro, Madagascar
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.1 × 3.5 × 2 cm
Description

Short prismatic brown crystal of “orthite”, an old name for allanite, with brown colour and an external red reaction coating. According to the old original handwritten label the crystal has a high Thorium content.

Ex. Ennio Contarini (#663).

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

Seller Information

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