Green tourmaline, also known as verdilite, is a variety of the mineral tourmaline known for its vibrant green color and various shades ranging from light to dark.
Green tourmaline is found in many locations around the world, including Brazil, Madagascar, Afghanistan, Namibia, and the United States. It forms in pegmatites, which are coarse-grained igneous rocks typically found in association with granites. These pegmatites provide the necessary conditions for the growth of tourmaline crystals, including the presence of elements like lithium, boron, and aluminum.
Green tourmaline crystals can vary widely in appearance depending on their specific chemical composition and geological conditions of formation. They typically exhibit a rich green color that can range from pale mint green to deep forest green. The color intensity may be uniform throughout the crystal or show zoning, where different shades of green are present in distinct bands or zones.
Green tourmaline crystals often have a prismatic or columnar shape, with striations running parallel to the length of the crystal. They may occur as individual elongated crystals or as clusters embedded in the host rock. Some specimens may display exceptional clarity and transparency, while others may contain inclusions or exhibit a more opaque appearance.
Due to its attractive color and unique properties, green tourmaline is highly valued in the gemstone market and is commonly used in jewelry, as well as for its metaphysical and healing properties.