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Fluorbritholite-(Ce) & Uraninite & Allanite-(Ce)

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RMM86235

Fluorbritholite-(Ce) & Uraninite & Allanite-(Ce)

Rare Mineral

Description Tabs

Description
Locality: 
Jamestown, Boulder County, Colorado, United States of America
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 4.5 × 3 cm
Description

This is a specimen of grey, massive fluobritholite-Ce which is outlined by a "rind" of allanite-ce, all in a quartz/feldspar matrix. Microscopic grains of uraninite are included in the grey mass which causes the piece to be mildly radioactive. Yttrofluorite, monazite-(Ce), zircon, and other uranium silicates have been reported from this find, and may be present in this sample. The piece weighs approximately 120 grams.

Collected by Philip Persson in 2011 and subsequently tested and ID'd by Pavel M. Kartashov - see http://www.mindat.org/photo-402435.html

Mineral Data
What's on the rock

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

Uraninite

Formula: 
UO2
Strunz: 
4.DL.05
Crystal System: 
Isometric
Hardness: 
5.0 - 6.0
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Allanite-(Ce)

Formula: 
{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Strunz: 
9.BG.05b
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0
Type Locality: 
Qáqarssuatsiaq, Aluk Island, Kap Farvel, Kujalleq, Greenland

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