Fluorapatite, Schorl
Boulder Batholith, Jefferson County, Montana, USA
A single, terminated crystal, greenish-yellow, exhibiting a termination comprised of the first- and second-order pyramids and the basal pinacoid (pedion). Crystal is fairly transparent, but outside surface somewhat dull, and locally encrusted with tiny, acicular schorl crystals. Found in association with smoky quartz, microcline, albite, and large ...
© William C. van Laer, 2008