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Risörite

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SKY1012949

Risörite

Rare Mineral

Description Tabs

Description
Locality: 
Gjerstad, Agder, Norway
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2 × 2 cm
Description

Dark green-black shiny crystal aggregates of risorite, a variety of fergusonite-(Y) with the extremely rare earth Erbium (Er) !. 

Only one Erbium mineral exists from almost 6000 mineral species known , plus 4 varieties with erbium in its composition. Risorite is one of these varieties, so it is an extreme rarity.

Formula: (Y,Er)(Nb,Ti,Ta)(O,OH)4

Ex Vandenbroucke Museum collection from Waregem, Belgium.

Mineral Data
What's on the rock

Risörite

Variety Of: 

Fergusonite-(Y)

Formula: 
YNbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5
Formula: 
(Y,Er)(Nb,Ti,Ta)(O,OH)4
Hardness: 
0.0

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