Allanite-(Ce) - Yates Mine, Otter Lake, Pontiac RCM, Outaouais, Quebec, Canada

(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)

Allanite-(Ce) from the Yates Mine, located in Otter Lake, Quebec, Canada, is a noteworthy example of a rare-earth-element-rich mineral. Allanite-(Ce) belongs to the epidote group and is a complex silicate containing significant amounts of cerium ($Ce$) and other light rare earth elements (LREEs), alongside calcium, aluminum, and iron. Its chemical formula is typically expressed as $(Ce,Ca,Y)(Al,Fe^{3+})_3(SiO_4)(Si_2O_7)O(OH)$, reflecting its intricate structure and composition. The Yates Mine is renowned for producing well-formed allanite-(Ce) crystals in a geologically unique environment.

Approx. specimen size: 42mm x 40mm x 20mm

Approx. specimen weight: 54.2 grams

Approx. specimen sctivity on an SE International Ranger EXP: 500 cpm