Cassiterite

$250.00

$40.00 shipping
Seller offers an extended return window of up to 30 days
Ships from USA

Crystal ClassicsFeatured

Tucson, Arizona, USA

7,543 for sale·132 sold

Wheal Trevaunance, situated at St. Agnes on the north coast of Cornwall, England, is particularly well known among collectors because of its rare crystal habits of Fluorite. It was however a copper and tin mine and produced good specimens of Cassiterite that tended to develop on the joint planes of killas. Killas is the Cornish miner’s term for metamorphosed sediments. Many well developed Cassiterite crystals densely cover a matrix of dark grey killas mixed with fragmented milky Quartz and various sulphides. The largest Cassiterite crystals attain 1.5 cm and are jet black with a bright metallic lustre.