An almost solid specimen of Cassiterite/Chlorite with a cavity atop the specimen lined with euhedral crystals, from the Trevaunance Mine (well known for fine Cassiterite), St. Agnes. Crystals of lustrous dark brown to yellow-brown Cassiterite display classic habit measuring to 7mm. Smaller cavities on the specimen also show Cassiterite crystals. A rich crystal Cassiterite from the mine.