Natural Blacknite iridescent ferrous Goethite with Covelien & Bornite overgrown quartz clusters from Ambositra in Madagascar.

Special and New, Blacknite Quartz is a ferrous Goethite/Hematite with a natural overgrowth of Covelien and Goethite with pink/purple, black, blue and iridescent patina. This is almost like a black aura quartz, but is a 100% natural appearance, with iridescent blue, pink and yellow aura. The amount and quality of the patina is variable, with some specimens only partially overgrown, exposing a beautiful white optic to near-optical individual small to medium-sized crystals in dense and complex arrangements. Great new material ideal for the collectors. Goethite is a ferrous hydroxide mineral. Goethite often forms through the weathering of other iron-rich minerals. But in this mine in Ambositra in Madagascar, this mineral not only agglomerated in the form of super beautiful crystals and clusters, but also with this amazing iridescent color. If you didn't know better, you would think that this is a non-natural aura quartz, but nothing could be further from the truth, it is a purely natural coating that has been created by specific circumstances. As far as is known, this combination only occurs in Madagascar and at a specific mine in South Africa. Goethite is a common iron ore, which occurs all over the world through the weathering of other ferrous minerals such as magnetite and pyrite. In Europe it occurs in, among others, Alsace-Lorraine (France), Westphalia (Germany) and Bohemia (Czech Republic). It is also used as a clay pigment; Goethite has been found as a pigment in the cave paintings of Lascaux in France. Limonite, the imperfectly crystallized variant of Goethite, is a constituent of the rock umber. In 2004, the mineral was also identified on the planet Mars by NASA's "Spirit" robot. This may indicate that water was present on Mars in the past, as Goethite is only formed in the presence of water.