Mineralpedia Details for Calkinsite-(Ce)
Calkinsite-(Ce) from Big Sandy Creek, Bearpaw Mts., Hill Co., Montana, United States
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Very rich coverage of tiny light mustard-yellow microcrystals composed of micro-platy Calkinsite-Ce that is possibly associated with microcrystalline Lanthanite, which are visually indistinguishable at this micro scale.
The REE carbonates at the Vermiculite deposits at Big Sandy Creek include Burbankite (TL), Ancylite, Lanthanite, and Calkinsite-Ce (TL), and according to Pecora & Kerr's American Mineralogist article (1953) the Lanthanite and Calkinsite-Ce are the decomposition products of Burbankite.