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Peridot

Geology / History
Peridot is magnesium rich gem quality Olivine. The strength & shade of green depends on the Iron quantity present within. Peridot is often found in lavas & is the only gemstone found in meteorites.
The name Peridot is derived from the Greek "peridona", meaning giving plenty & is known as a stone of prosperity. Olivine is a common mineral in mafic, ultramafic rocks & metamorphosed impure dolomites. It is often found in lavas & peridotitexenoliths of the mantle, which are carried to the surface by lavas.
Gem quality Peridot only occurs in a fraction of these settings & is rather rare. This is due to the mineral's chemical instability on the Earth's surface. Olivine is usually found as small grains & tends to exist in a heavily weathered state, unsuitable for decorative use.

Metaphysical Properties
A stone of happiness, believed in ancient times to keep away evil spirits. Helps to release feelings of anger, fear & jealousy. Removes all negative energy & protects auric field.
Peridot can be used to balance, cleanse & stimulate the heart chakra. This stone imparts Divine trust & compassion. Peridot is excellent for healing & protects the healer while enhancing abilities. It assists in rebirth & renewal of all kinds making it ideal for manifestation. Peridot also brings abundance & prosperity. Holds harmony & vibrant love within. Guides you to understanding your destiny & spiritual purpose.

Crystal Healing
Solar plexus, heart & throat chakra. Assists premature birth & ageing. Stress & cardiovascular issues. Joint function & nervous tension.

Mineralogy
Group: Silicate-Nesosilicate; Olivine Group (Magnesium rich forsterite)
Crystal System: Orthorhombic
Composition:(Mg, Fe)2SiO4
Form/Habit: Octahedral
Hardness: 7
Cleavage:Perfect, perfect on {010}, imperfect on {100}
Fracture: Conchoidal
Lustre: Vitreous - glassy
Streak: White
Specific Gravity: 3.2-4.3
Transparency:Transparent, Translucent
R.I: 1.64–1.70
Colour:Yellow to yellow-green, olive-green to brownish, sometimes a lime-green to emerald-ish hue
Birefringence:+0.036
Causes of Colour: Iron