Jade is famous the world over for its ornamental qualities, and revered in many Asian cultures as well as Central and South American civilizations. Jade is often mistaken for either nephrite or jadeite. In actual sense, jade is a general term for both nephrite and jadeite; nephrite is a calcium and magnesium rich form of jade (jade + actinolite), while jadeite is a sodium and aluminum rich variety (jade + pyroxene). Jade has a complex mineral formula; both types of jade sometimes occur with other minerals in the mix. Jade occurs in many shades of green, with the greatest variance
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