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Bastnäsite-(La) Allanite-(La) & Fluorbritholite-(Ce)

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Bastnäsite-(La) Allanite-(La) & Fluorbritholite-(Ce)

Type Locality
Analysed

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Description Tabs

Description
Locality: 
Mochalin Log, Kyshtym, Chelyabinsk Oblast, Russian Federation
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.2 × 0.4 × 0.6 cm
Description

Very nice specimen of pebble (!) fragment with very rare, yellow, HYDROXYLbastnäsite-(La), black Allanite-(La) and brown Fluorbritholite-(Ce) from unique Au and REE placer deposit - Mochalin Log in Chelyabinsk area (Russia). Analysed!

Mineral Data
What's on the rock

Bastnäsite-(La)

Formula: 
(La,Ce)(CO3)F
Strunz: 
5.BD.20a
Crystal System: 
Hexagonal
Hardness: 
4.0 - 5.0
Type Locality: 
Belaya Zima REE-Nb deposit, Eastern Sayan, Sayan Mts, Tuva Republic, Eastern-Siberian Region, Russia

Allanite-(La)

Formula: 
{CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05b
Crystal System: 
Monoclinic
Hardness: 
6.0
Streak: 
Brown
Type Locality: 
Buca della Vena Mine, Ponte Stazzemese, Stazzema, Apuan Alps, Lucca Province, Tuscany, Italy

Fluorbritholite-(Ce)

Formula: 
Ca2(Ce,Ca)3(SiO4,PO4)3(F,OH)
Strunz: 
9.AH.25
Crystal System: 
Hexagonal
Hardness: 
5.0
Type Locality: 
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

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