Nephrite, the commoner form of jade, is an amphibole, a combination of tremolite and actinolite, occurring in China, Russia, New Zealand, and the western United States. Jadeite, rarer than nephrite and prized for its more intense color and translucence, is a sodium aluminum pyroxene, found chiefly in upper Burma. Hardness: 5–6; relative density: 3–3.4.
Related category GEOLOGY AND PLANETARY SCIENCE
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