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PERIDOT


Chemical Composition: Magnesium Iron Silicate, (Mg,Fe) 2 SiO 4
Refractive Index: 1.65 – 1.69
Specific Gravity: 3.32 – 3.37
Crystal System: Orthorhombic
Moh's Hardness: 6 ½
A gem variety of the olivine mineral and is an isomorphous stone with
magnesium silicate and iron silicate as end members. Colour varieties vary
between pale yellow green to a deep green and rare colours include brown.
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Localities include China, Burma, Pakistan, USA
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