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Mineralpedia Details for Monazite-(Ce)

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Monazite-(Ce)

Monazite-(Ce)

Formula
CePO4 
Crystal System
Monoclinic 
Crystal Habit
Crystalline - Fine, Twinning Common 
Cleavage
Distinct, Indistinct, None 
Luster
Adamantine - Resinous 
Color
brown, colorless, greenish, gray white, yellow 
Streak
grayish white 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
5-5.5 
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Monazite-(Ce) from Sheep Creek, Ravalli Co., Montana, United States

Monazite-(Ce)
            from Sheep Creek, Ravalli Co., Montana, United States

A large 1lb, very nice specimen loaded with dozens of reddish brown crystals up to 6mm.  Overall 14 x 11cm.

Monazite is a rare earth phosphate with up to 12% thorium oxide and the primary source of thorium. Thorium is thermally stable and insoluble and used in refractory applications including glass, optics, and ceramics. It is typically mined from off-shore placers mainly in Sri Lanka and India. Specimens with abundant Monaite in rock like this specimen are rare and hard to come, especially from this deposit. The deposit is geologically interesting with unusual characteristics and was published in the a 1961 American Mineralogist.

1 lb 11 oz

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Monazite-(Ce) from Trolvis Quarry, Longdowns, Stithians, Cornwall, England

Monazite-(Ce)
            from Trolvis Quarry, Longdowns, Stithians, Cornwall, England

Tiny 1mm and less rosettes of tan Monazite crystals on tourmaline.

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