Detailed information
Dimensions
42 x 52 x 33
mm
Locality
Twll Maen Grisial Fron Olau, Prenteg Gwynedd, Wales
Condition
No recorded repairs
Simply the mention of Prenteg conjures thoughts of the three titanium dioxide polymorphs and this terrific miniature is a rich example of Brookite richly scattered over a bed of glassy micro-crystals of Albite with Quartz. The actual locality is Twll Maen Grisial, a little to the southwest of Prenteg, the type locality for Brookite which holds an iconic status in British mineralogy. Over twenty semi-transparent golden bronze Brookite crystals of up to about 1 mm occur on the Albite and sparkle brightly when the specimen is rotated.
