Druzy or drusy or druse refers to a layer of tiny crystals that occurs either on the breaking surface of a rock or in a geode. Druzy quartz or agate are more common and garnet, calcite and dolomite are less common. In general, it is possible to find natural druzy gemstones at any location with water that has evaporated. They often occur along rivers and coasts.
Quartz is one of the most common minerals, making up almost 12% of the Earth’s crust. It is also known as silicon dioxide and is encountered in sedimentary and volcanic rocks. When found at high temperature during the last phase of its precipitation, quartz crystallizes within only a few months. It is mined in Brazil, Japan, America and Switzerland.