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Allanite

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PDM737947

Allanite

Description Tabs

Description
Locality: 
Marosoritse, Jafaro, Ambovombe-Androy, Androy, Madagascar
Class: 
Single Crystal
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 6 × 3.6 cm
Description

Big prismatic crystal of “orthite” (an old name for allanites), with brown colour and an external reddish reaction rim. It is complete with rounded edges.

According to the associated label it was found by French geologist Georges Heurtebize in the 1950’s-1960’s.

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

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