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- Brown Derby mine, Quartz Creek Pegmatite dist., Gunnison Co., Colorado, United States
- Miniature 3.5x3.5x2cm
- phosphate , REE mineral
Brick red well-formed crystals. One of the larger crystals may indeed be formed with an intergrowth of Quartz, much like feldspar and quartz typically found in pegmatites, such as this locality. The Brown Derby pegmatite is a rare-earth pegmatite with besides Monazite also has Euxenite, pyrochlores, microlites, pollucite, Col-Tan, srtibiotantalite and alot of other good pegmatite minerals. I do not know if this Monzaite it at the Sm or Ce end, probably bot. The specimen number matches the label.
Any pegmatite collector should have one of these and it is a fine specimen.
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- Sheep Creek, Ravalli Co., Montana, United States
- Cabinet 14x11.5x4cm
- REE mineral
A large, very nice specimen loaded with dozens of reddish brown crystals up to 6mm.
Monazite is a rare earth phosphate with up to 12% thorium oxide and the primary source of thorium. Thorium is thermally stable and insoluble and used in refractory applications including glass, optics, and ceramics. It is typically mined from off-shore placers mainly in Sri Lanka and India. Specimens with abundant Monaite in rock like this specimen are rare and hard to come, especially from this deposit. The deposit is geologically interesting with unusual characteristics and was published in the a 1961 American Mineralogist.
1 lb 11 oz