Green opal from Madagascar.
Size-
12.5cm x 8.5cm x 8cm
Weight-
811g
You will receive the item in the photo
Green Opal is classified as a mineraloid rather than a true mineral because it lacks an ordered atomic lattice.
Green Opal belongs to the hydrated silica mineral class and is amorphous is the crystal system. Its hardness is 5.5-6.5 on the MOHs scale. Rock formation is sedimentary and volcanic environments.
Traces of nickel or other impurities gives Green Opal its colour.
Green opal is formed by silica rich fluids that seep into underground cavities, fissures and porous rocks like sandstone rhyolite or volcanic environments. Over millions of years water content evaporates, and the silica gel solidifies to form solid deposits and conceptions.
