Moldavite Rare Double Opal Pineapple Moldavite [ SiO2(+Al2O3) ] Moldavite is a forest green, olive green or blue greenish vitreous silica projectile of rock formed by a meteorite impact in southern Germany (Nördlinger Ries Crater) that occurred about 15 million years ago. Moldavite is a type of tektite. Because of their difficult fusibility, extremely low water content, [...]

Opal Pineapple

Twin Opal PineappleRare Double Opal Pineapple Double Opal Pineapple [ SiO2nH2O ] In Australia, precious opal is found in Cretaceous age sandstones and mudstones. These sedimentary rocks were deeply weathered and this weathering released silica into the groundwater. Small faults and joints in the rocks formed pathways for movement of the groundwater as it penetrated downwards. [...]

Gold over Quartz

GoldRare Double Opal Pineapple Gold [ Au ] over Quartz [ SiO2 ] Gold in its natural mineral form almost always has traces of silver, and may also contain traces of copper and iron. A Gold nugget is usually 70 to 95 percent gold, and the remainder mostly silver. The colour of pure Gold is bright golden [...]