Brookite with Anatase

The mention of Prenteg conjures thoughts of the titanium dioxide polymorphs and this terrific miniature is a nice example of two, Brookite and Anatase. The tabular Brookite crystal measures 6 mm long and sits at an angle to the fine grained pale green Quartz matrix, studied with micro-crystals of colourless glassy Quartz. The Brookite is classically terminated and exhibits a reddish toffee orange glow through its translucency.  Several bluish black Anatase bipyramidal crystals to about 1 mm tall are also embedded in the matrix.  A good representative small miniature of Brookite and Anatase from Prenteg in Gwynedd, Wales, the type locality for Brookite.