All Things Jade
Jade is an ornamental stone. The term jade is applied to two different metamorphic rocks that are made up of different silicate minerals:

Nephrite consists of a microcrystaline interlocking fibrous matrix of the calcium, magnesium-iron rich amphibole mineral series tremolite (calcium-magnesium)-ferroactinolite (calcium-magnesium-iron). The middle member of this series with an intermediate composition is called actinolite (the silky fibrous mineral form is one form of asbestos). The higher the iron content the greener the colour. Nephrite Jade, also known as Monterey Jade or Big Sur Jade, can be found along the Big Sur Coast. We carry Monterey Jade, as well as Jade from the Yukon Territory and Wyoming.

Jadeite is a sodium- and aluminium-rich pyroxene. The gem form of the mineral is a microcrystaline interlocking crystal matrix. This is found in fewer than 12 places in the entire world.

The chart  from Mason-Kay Fine Jade Jewelry shows the different colors that jade can naturally be.
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