Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch faceted_coins occuring 10

occuring 10

The most common members of the feldspar group are the plagioclase feldspars and the alkali feldspars

also known as Nacre

Additionally

The most precious Fire Opal has flashes of iridescence and is known as Precious Fire Opal or “Firmament Stone

Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch faceted_coins occuring 10This variety of opal is named "dendritic" for the small inclusions within it that resemble moss or ferns. These inclusions consist of iron, manganese and other metallic oxides captured during the forming of the rock. Opals are hydrated amorphous forms of silica, created when silica hardens within the fissures of other stones.