Amethyst is a well known mineral and gemstone Deep colored amethyst crystals known as cactus quartz because of the layer of small spiky crystal growth on the larger crystals It is the purple variety of the mineral quartz, and its most valuable and prized variety
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Its name derives from the greek amethystos, which means not drunken, as amethyst in antiquity was thought to ward off drunkenness
The color of some amethyst specimens from certain localities slowly fade upon prolonged exposure to light
This term in the gem trade usually applies to deeply colored or darker amethyst. Pectolite is a unique mineral known for its interesting crystal habits Its crystals primarily form as extremely slender and elongated densely grouped fragile fiber s radiating from a central point outwards Pectolite can be tough and dense, but is often very delicate and soft to the touch
Detailed description, properties, and locality information guide about the mineral datolite. Vitreous luster glossary term at minerals.net educational reference guide Detailed description, properties, and locality information guide about the mineral scapolite (meionite and marialite).
