Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch 9mm Tourmaline is classified as a

Tourmaline is classified as a semiprecious stone and occurs in a vast array of colors

Rutilated Quartz is a silicon dioxide mineral with unique needle-like inclusions of Rutile

Tibet and other Asian countries

potassium or barium

Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch 9mm Tourmaline is classified as aThis 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.