August-Peridot

Colour	Usually green-may vary due to impurities
Formula	(Mg,Fe)2SiO4
Group	Silicates
Uses	Jewellery
Origins	Found mostly as inclusions in basalt or gabbro
Locations	Australia, Brazil

Peridot is a variety of olivene which contains magnesium and iron. Usually it contains equal amounts of these two elements. However if there is more iron than magnesium it may appear more green and if there is more magnesium it is more yellow.

It was first found on the Red Sea island Jazairat.