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Fergusonite-(Y)

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LGM607059

Fergusonite-(Y)

Ex Ennio Cantorini coll., ex Museum Milano
With Antique Label

Description Tabs

Description
Locality: 
Ytterby, Resarö, Vaxholm, Stockholm County, Sweden
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
2.1 × 2.7 × 1.2 cm
Weight: 
9.00gr
Description

An aggregate of "Arrhenite", a tantalate and silicate of the rare earths Y and Er, Ca, Zr, etc. Probably a mixture.
Originally reported from Ytterby, Resarö, Vaxholm, Stockholm, Sweden, now discredited as fergusonite-(Y). The label means: "Arrhenite bruna resinosa (Varieta di Fergusonite) Ytterby (Svezia)" Arrhenite brown resinous (variety of fergusonite) Ytterby (Sweden).

A rare historic specimen, acquired by Ennio Cantorini (1890-1975), an italian collector. Probably after his death gone to the Museo Civico di Storia Naturale di Milano, one of Italy's most important museums of natural history. Some parts of the museum's depot were sold to a well-known english mineral dealer recently.

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

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