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Fergusonite-(Y) Var Risörite

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LGM702154

Fergusonite-(Y) Var Risörite

Ex Dr. Krantz, Bonn, Germany
Type Locality

Description Tabs

Description
Locality: 
Risør, Agder, Norway
Class: 
Massive/Crystalline
Size Range: 
Small cabinet (7-10 cm)
Size: 
6 × 8 × 3.5 cm
Weight: 
172.00gr
Description

Risörite is a titaniferous (up to 5 mass% TiO2) variety of Fergusonite-(Y). Here is a specimen from the name-giving locality of first description. It hosts some amorphous, blackish masses of risörite in pegmatite matrix.

From old Dr. Krantz stock, comes with antique label.

Slightly radioactive due to content of U, Th and rare earth elements (appr. 1.8 micro Sv/h within spitting distance).

Mineral Data
What's on the rock

Fergusonite-(Y)

Formula: 
YNbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5
Type Locality: 
Kangeq, Sermersoq Island, Kujalleq, Greenland

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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