Churchite-(Y)
YPO4·2H2O
Locality:
Leonie I Mine (Leonie Mine; Alte Leonie Mine), Auerbach, Upper Palatinate, Bavaria, Germany
Field of view: 4 mm
Photo by Matthias Reinhardt
A rare mineral consisting of a hydrated phosphate of rare earth elements (chiefly yttrium; originally thought to be chiefly cerium). Locally abundant; typically derived from meteoric waters, with yttrium weathered or biochemically leached from trace amounts in surrounding rocks or soil, deposited on colloidal Fe–Mn oxides; less commonly a secondary mineral in hydrothermal mineral deposits. Thermoluminescent upon gentle heating.
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