Olivine,iron magnesium silicate,is common throughout the world and is one of the first minerals to form in a cooling lava flow. It belongs to the chrysolite group of minerals,which include forsterite (magnesium silicate) and fayalite (iron silicate). Olivine is a mixture of these two species. Excellent crystals occur in a number of localities,including a remote island in the Red Sea near Egypt that has been known variously as Zebirget,Zabargad and St. John's Island. The olivine crystals on this island are transparent and a rich green color,allowing them to be cut as gemstones. The gem form of olivine is called peridot,and is the August birthstone | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Arem, Joel |
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