Brockite is a phosphate, arsenate, or vanadate mineral with the formula (Ca,Th,Ce)(PO4)·H2O, crystallizing in the hexagonal system.
Photos
Raúl Jorge Tauber Larry · CC0 · CommonsPerna, Maria Grazia and Zaccaria, Daria and Rosatelli, Gianluigi and Stoppani, Francesco Saverio and Curti, Ezio and Spratt, John and Humphreys-Williams, Emma and Najorka, Jens and Brownscombe, Will and Nestola, Fabrizio and Stoppa, Francesco · CC BY 4.0 · CommonsJoan Rosell · CC BY-SA 4.0 · Commons