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Peridot Gemstone

Peridot Gemstone, Green Peridot

The origin of the name "peridot" is uncertain. The Oxford English Dictionary suggests an alteration of Anglo–Normanpedoretés (classical Latinpæderot-), a kind of opal, rather than the Arabic word faridat, meaning "gem".

Peridot is the transparent gem variety of the mineral olivine.

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 how much iron is contained in the crystal structure, so the color of individual peridot gems can vary from yellow- to olive- to brownish-green. The most prized of peridot is dark olive-green colour.

However,the largest faceted peridot olivine is a 310 carat specimen in the Smithsonian Museum in Washington, D.C.

Chemical (Mg, Fe)2SiO4, with Mg in greater quantities than Fe. Magnesium iron silicate.
composition Peridot is a member of an isomorphous series with forsterite (magnesium silicate) and fayalite (iron silicate) as 'end members' of this olivine series.
Crystal system Orthorhombic.
Cleavage Poor.
Hardness 6.5 – 7 on moh’s scale
Specific gravity 3.32 to 3.37
Colour Pale yellowish-green to deep green, greenish-brown to brown (rare).
Pleochroism Weak, green and yellowish-green.
Lustre Vitreous, sometimes appears oily.
Refractive index 1.65 to 1.69
Birefringence 0.036 Inclusions and facet edges may appear doubled through the 10x lens.
Dispersion Medium.
Optical nature Biaxial.
Inclusions Black chromite crystals which induce flat stress cracks - these resemble water-lily leaves. Mica flakes - these may give the stone a slightly brownish hue.

In larger stones inclusions appear doubled due to the large double refraction.
Localities Main sources of gem material include China, Myanmar (Mogok district), Pakistan, USA (Arizona) and Zabargad (S1, John's Island) in the Red Sea.

Peridot Gemstone, Green Peridot

Substitute For Emerald
Comments Olice Green Color comes with little incusions



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