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Synchysite-(Ce) & Bastnäsite-(Ce)

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POL843595

Synchysite-(Ce) & Bastnäsite-(Ce)

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Description
Locality: 
Lugeengol, Hövsgöl, Dornogovi Aimag, Mongolia
Class: 
Massive/Crystalline
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.4 × 3.2 × 3.2 cm
Description

Very interesting specimen of massive, orange-brown mixture of Synchysite-(Ce) with Bastnäsite-(Ce) with minor pyrite in white dolomitic (carbonatite) matrix from rarely seen locality - Lugeengol REE deposit in Mongolia. From my personal collection. Specimen like this was analysed.

Mineral Data
What's on the rock

Synchysite-(Ce)

Formula: 
Ca(Ce,La)(CO3)2F
Strunz: 
5.BD.20c
Hardness: 
4.5
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), Narsaq, Kujalleq, Greenland

Bastnäsite-(Ce)

Formula: 
(Ce,La)(CO3)F
Strunz: 
5.BD.20a
Crystal System: 
Hexagonal
Hardness: 
4.0 - 4.5
Type Locality: 
Bastnäs mines, Riddarhyttan, Skinnskatteberg, Västmanland, Sweden

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