Aggregate of reddish brown neighborite crystals. These relatively uncommon orthorhombic crystals simulate a cubic symmetry, with faces resembling octahedrons modified by cube faces. Associated minerals include brownish-green aegirine, siderite/dolomite, with everything sitting on small, sharp microcline crystals that fluoresce bright red under short-wave UV light. Neighborite, composed of a double fluoride salt of sodium and magnesium, was named after Frank Neighbor, a geologist for the Sun Oil Co. based in Salt Lake City, Utah.
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