Size 17 x 11 x 8 cm - weigh 1355 grams Chalcanthite, a large, amazing natural specimen ! Museum-sized, diverse in beautiful colors Its name comes from From the Greek chalkos, "copper" and anthos, "flower."From ''Hilarion'' Mine, Agios Konstantinos, Lavrion Mining District, Lavreotiki, East Attica, Greece Chalcanthite is natural, water-soluble copper sulphate. A secondary mineral that is formed in arid climates or in rapidly oxidizing copper deposits. It is usually of post-mining formation, forming on mine walls and by the action of acidic surface waters on copper veins. will be sent with a security number