Dendritic Opal 6mm Hexagon - 15-16 Inch R1526 Its inclusions of red

Its inclusions of red

Blue Tourmaline ranges in color from green to blue to yellow to green with black

discovered a way to improve the quality of turquoise in the 1980's

The yellowish colors of heliodor are usually caused by small amounts of iron within the mineral's crystal structure

Dendritic Opal 6mm Hexagon - 15-16 Inch R1526 Its inclusions of redThis 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.