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Jade has three variations: chloromenlanite, jadeite, or nephrite. The latter is the mineral form found in Alaska. It mainly consists of silica and magnesia. The amount of iron present helps to determine its color, which is usually green but sometimes gray, yellow or black. It has been carved extensively by Alaska Native artisans. An entire mountain of dark green jade is located on the Seward Peninsula. Alaska chose this gem in 1968.