|Category||Silicate mineral variety|
|Color||Yellow, to yellow-green, olive-green, to brownish, sometimes a lime-green, to emerald-ish hue|
|"Mohs scale hardness||6.5–7|
Peridot ("// or "//) is gem-quality "olivine, which is a "silicate mineral with the formula of (Mg, Fe)2SiO4. As peridot is the "magnesium-rich variety of olivine ("forsterite), the formula approaches Mg2SiO4.
The origin of the name peridot is uncertain. The "Oxford English Dictionary suggests an alteration of "Anglo–"Norman pedoretés (classical "Latin pæderot-), a kind of "opal, rather than the "Arabic word faridat, meaning ""gem".
The earliest use in England is in the register of the "St Albans Abbey, in Latin, and its translation in 1705 is possibly the first use of "peridot" in English. It records that on his death in 1245, Bishop John bequeathed various items including peridot to the Abbey.
Peridot is one of the few gemstones that occur in only one color: an "olive-green. The intensity and tint of the green, however, depends on the percentage of "iron that is contained in the crystal structure, so the color of individual peridot gems can vary from yellow, to olive, to brownish-green. In rare cases, peridot may occur in a medium-dark toned, visually pure green with no secondary yellow hue or brown mask.
"Olivine, of which peridot is a type, is a common mineral in "mafic and "ultramafic rocks, and it is often found in "lavas and in "peridotite "xenoliths of the "mantle, which lavas carry to the surface; but gem quality peridot occurs in only a fraction of these settings. Peridots can also be found in meteorites.
Peridots can be differentiated by size and composition. A peridot formed as a result of volcanic activity tends to contain higher concentrations of lithium, nickel and zinc than those found in meteorites. .
Olivine in general is a very abundant mineral, but gem quality peridot is rather rare. This is due to the mineral's "chemical instability on the Earth's surface. Olivine is usually found as small grains, and tends to exist in a heavily weathered state, unsuitable for decorative use. Large crystals of "forsterite, the variety most often used to cut peridot gems, are rare; as a result olivine is considered to be "precious.
The principal source of peridot olivine today is the "San Carlos Apache Indian Reservation in Arizona. It is also mined at another location in "Arizona, "Arkansas, "Hawaii, "Nevada, and "New Mexico at "Kilbourne Hole, in the US; and in "Australia, "Brazil, "China, "Egypt, "Kenya, "Mexico, "Myanmar (Burma), "Norway, "Kashmir, "Saudi Arabia, "South Africa, "Sri Lanka, and "Tanzania.
Peridot is sometimes mistaken for "emeralds and other green gems. Notable "gemologist "George Frederick Kunz discussed the confusion between "emeralds and peridots in many "church "treasures, notably the ""Three Magi" treasure in the "Dom of "Cologne, Germany.
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