What is Druzy?
The word druse (referred to as druzy in jewellery), refers to an collective mass of small crystals (“crystal druse”). A druzy is a set of tiny crystals derived from minerals that form on the surface of another stone.
These crystal intergrowths or clusters can be formed by many different minerals. The minerals and shapes of crystals depend on fluid composition at the time of formation. Crystal size is a function of fluid temperature and pressure.
There are many types of druzy because there are many types of minerals. Each type of druzy has distinctive characteristics, such as crystal size, lustre and colour.
Quartz is one of the most common druzy types because of the prevalence of silica throughout the Earth.
No matter what mineral forms the druzy, the overall appearance usually resembles that of sugar. A Druzy’s tiny crystals are considered beautiful because, like large gemstones, they glitter and catch rays of light at different orientations.
The geological process that forms a druzy, the layer of crystals on the rock, occurs when hydrothermal fluids are in contact with a rock's surface. When these fluids cool, minerals are left behind to form crystals on the surface of the rock. Depending on the minerals, druzy gemstones can be almost any colour of the rainbow, including white, pink, blue, purple, green or black.