Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch faceted_coins Kyanite is also extremely useful

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

forming Tektite

Formed deep underground during the cooling of magma

It is opaque

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 Kyanite is also extremely usefulThis 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.