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Also known as vesuvianite, idocrase a complex silicate that is sometimes used as a gemstone. While the mineral can be found in a wide variety of hues - including a sky-blue copper-containing variety from Norway, cyprine - almost all gem idocrase is yellowish-green in color. As a result, the faceted transparent gems often resemble peridot, while the opaque material is sometimes used as a jade simulant. This has caused idocrase to sometimes be known by a variety of jade-related misnomers, including "American jade", "California jade" and "Happy Camp jade".

Idocrase was first discovered in the late eighteenth century around the vicinity of Mount Vesuvius, close to the southern Italian city of Naples. This volcano is, of course, best known for its 79 AD eruption that destroyed the Roman city of Pompeii.

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