370 Carat Gem Quality Silica Blue Chrysocolla Rough Stone Natural Crystal Cab Mineral Cabochon Rock for Carving - Peru (#2) You will receive exactly this Chrysocolla Rough - 61mm x 34mm x 23mm / 2 7/16 x 1 3/8 x 15/16 Inches; 74g / 2.6 oz / 370 Carat (see photo, some photos are taken wet, stand not included)! Chrysocolla is attractive blue-green that provides a unique color to the mineral world. Chyrsocolla is perhaps more appropriately a mineraloid than a true mineral. Most of the time it is amorphous meaning that it does not have a coherent crystalline structure. However at higher temperatures it does demonstrate a distorted crystal structure that seems to be composed of Si4 O10 sheets. Chrysocolla forms in the oxidation zones of copper rich ore bodies. The name Chrysocolla derives from Greek chrysos - gold and kolla - glue, referring to its use as a flux in soldering gold. The term was used from antiquity. Chrysocolla is often found in a matrix of quartz, in which case the optical and physical properties may be closer to those of quartz. Chrysocolla covered by druses of small sparkling quartz crystals is called "Drusy Chrysocolla" and is very popular for jewelry. It is found in Peru. Formula: Cu2-xAlx(H2-xSi2O5)(OH)4nH2O: Category: Silicate mineral; Color: Blue-Green; (The above information is provided solely for informational purpose. Kindly note that all stones are offered for decorative purposes only. Please, handle your stones with great care, do not grind or crumble them, do not dip or add them into your food or drink, do not use any parts of them in any elixirs, potions, lotions etc. Always make sure you wash your hands before and after working with your crystals.)