Amethyst is the purple variety of the mineral Quartz, and is its most famous and valuable gem variety. Quartz also contains other gemstones such as Citrine, Rose Quartz, and Smoky …

Amethyst is a well known mineral and gemstone. It is the purple variety of the mineral Quartz, and its most valuable and prized variety. Its name derives from the Greek "amethystos", which …

Although Amethyst, the purple variety of Quartz, and Citrine, the yellow/orange variety of Quartz belong to the same scientific mineral classification, they have always been distinguished as …

Although Amethyst, the purple variety of Quartz, and Citrine, the yellow/orange variety of Quartz belong to the same scientific mineral classification, they have always been distinguished as …

Detailed description, properties, and locality information guide about the mineral corundum: ruby and sapphire.

Minerals A-Z List of Varieties and Other Names: Back to Minerals List | Filter List A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ALL

Canadian Amethyst - The Mineral and Gemstone KingdomAmethyst with an internal coating of red Hematite under the crystal surface, found near Thunder Bay, Ontario, Canada.

Citrine is the yellow to orange variety of Quartz. Natural Citrine is not common; most Citrine on the gem market is produced by heat treating Amethyst and Smoky Quartz. It takes a relatively low …

Amethyst Amethyst, the purple variety, is the most popular and valuable Quartz gemstone. Amethyst ranges from light to dark purple. See the Amethyst gemstone page for more details. …

Procedure performed to help identify a mineral. Certain acid s (usually hydrochloric acid and nitric acid) are placed in contact with the mineral or its powder, and, depending on the mineral, it …