Olivine is a magnesium iron silicate mineral and belongs to the orthorhombic crystal system. The crystals are short columnar. Complete crystals are rare. Most of them are irregular round granular aggregates. They have glass luster, διαφανές έως ημιδιαφανές, και σκληρότητα του 6.5-7.0. Olivine is a kind of self-colored gemstone, which is green due to iron […]
