Dendritic Black Opal 8mm Round - 15-16 Inch Color_Gold Spinel is a hard vitreous

Spinel is a hard vitreous magnesium aluminum oxide

as waters loosen and decompose the organic elements and replace them with silicate substances

the only region in the world where the stone is found

a microscopic protozoa with a silica shell

Tourmaline occurs in nearly every color in the rainbow and its name derives from “turmali

Dendritic Black Opal 8mm Round - 15-16 Inch Color_Gold Spinel is a hard vitreousThis 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.