Brookite on Quartz
Moses Hill, Magnet Cove, Hot Spring Co.
3.1 x 1.6 x 1.2 CM (thumbnail)
Late Summer 2018
Sizable Brookites scattered on a Quartz crystal from the classic locality of Magnet Cove. Choice older piece with several habits of Brookite some of which are very lustrous in person. The Quartz is doubly terminated and is the usual milky to smoky type with some signs of corrosion that is distinctive to this locale. In excellent undamaged condition.
The classic habit of saddle shape Dolomite crystals completely replaced by sparkling smithsonite. The matrix is also nearly all Smithsonite and mostly composed of the rare red-orange color but also has zones of the more typical yellow. A long running debate concerns the color being caused by either Cadmium or Greenockite inclusions. To me it is a distinction without a difference, Greenockite is simply Cadmium Sulfide and so that Cadmium is ultimately the source for the color. In good condition, only a few very minor abrasions can be seen, the Dolomite saddles are quite large and stand well above the matrix.