Block of black quartz (4.5kg)
PUMI1940
This dark mineral is a rock crystal from Madagascar. Quartz is not only found in the shape of points, but also in more massive veins. Also called Morion, these crystals owe their tint to a natural irradiation... Indeed, when the aluminium impurities contained in a quartz, are located near radioactive minerals such as uranium or thorium contained in granite, a change of coloring will gradually take place. It took millions of years to get this intense black color
This unique piece has been sold...
