A rich specimen of the rare mineral Clinoclase from Cornwalls most celebrated mine for various copper arsenates, namely Wheal Gorland, St. Day. Deep blue glistening areas of drusy Clinoclase crystals are seen in a number of cavities all over the specimen (particularly fine under magnification). Areas on the specimen also show an undefined green/pale green minutely botryoidal mineral. Both minerals invest a white Quartz matrix, very rich specimen from the mine.