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Bastnäsite With Malachite

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LGM721172

Bastnäsite With Malachite

ex F. Bauer, Ex Christian Rewitzer
Type Locality

Description Tabs

Description
Locality: 
Bastnäs Mines, Riddarhyttan, Skinnskatteberg, Västmanland County, Sweden
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 6 × 2 cm
Weight: 
74.00gr
Description

A colorful specimen from Bastnäs Mines, Riddarhyttan, Skinnskatteberg, Västmanland County, Sweden. It hosts brownish bastnäsite and green malachite (amongst other unidentified minerals). Pyrisite is mentioned on the label with question mark. This specimen is surely worth an analysis, maybe there are further rare minerals to be identified.

The Bastnäs Mines were iron, copper, and REE mines first mentioned in 1692. The elements cerium and lanthanum were discovered in minerals from Bastnäs, and they are type locality for not less than 10 minerals.

Comes with F. Bauer label. Franz Bauer was a collector in Munich, Germany. He deceased in the early 80's. The backside of the F. Bauer collection label mentions that this specimen was originally acquired at Ingmar Johannson. Kopparberg, Sweden. Comes with corresponding number sticker on the specimen.

No significant radioactivity was measured.

Mineral Data
What's on the rock

Bastnäsite

Synonym Of: 

Bastnäsite-(Ce)

Formula: 
(Ce,La)(CO3)F
Strunz: 
5.BD.20a
Hardness: 
4.0 - 4.5

Bastnäsite-(La)

Formula: 
(La,Ce)(CO3)F
Strunz: 
5.BD.20a
Hardness: 
4.0 - 5.0

Bastnäsite-(Nd)

Formula: 
Nd(CO3)F
Strunz: 
5.BD.20a
Hardness: 
4.0 - 4.5

Bastnäsite-(Y)

Formula: 
(Y,Ce)(CO3)F
Strunz: 
5.BD.20a
Hardness: 
4.0 - 4.5

Malachite

Formula: 
Cu2(CO3)(OH)2
Strunz: 
5.BA.10
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0

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