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Mineralpedia Details for Ancylite-(Ce)

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Ancylite-(Ce)

Ancylite-(Ce)

Named after the Greek word ankylos, which means “brackets,” likely referring to the curved parentheses as Ancylite commonly has curved, rounded crystal shapes, and also for the predominance of cerium over other rare earth elements in the mineral. Ancylite-Ce is an uncommon to rare mineral that can be found as an accessory mineral in nepheline syenite and carbonatites. Localities include in Greenland, Canada, the United States, Russia, Norway, China, Brazil, and the Democratic Republic of the Congo.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/ancylite-(Ce).pdf

Formula
CeSr(CO3)2(OH)·H2
Crystal System
Orthorhombic 
Crystal Habit
Crystalline - Fine, Pyramidal 
Cleavage
None, None, None 
Luster
Vitreous - Greasy 
Color
brown, brown red, colorless, gray, gray pink 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
4.5 
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Ancylite - (Ce) from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Ancylite - (Ce)
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Complex specimens with a nice "ridge" of well-formed pink, translucent micro crystals of Ancylite to 2mm as shown along the orange arrows. In combination with these rare crystals are brown Bastnasite in 2mm rosettes and prismatic, well-formed Nenadkevichite. All of these set off nicely with pink Rhodochrosite rhombs and 2cm Aegerine crystals.

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Ancylite-(Ce) from Afrikanda Massif, Kola Peninsula, Russia

Ancylite-(Ce)
            from Afrikanda Massif, Kola Peninsula, Russia

Creamy colored platy crystals.

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