Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch faceted_coins also known as Nacre

also known as Nacre

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

forming Tektite

” referring to the patterns in the stone looking like broken

Kyanite is also extremely useful in industrial applications due to its high heat resistance

Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch faceted_coins also known as NacreThis 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.