Madagascar Green Dendritic Opal 10mm Round - 15-16 InchThis 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.

Due to its natural porosity

tans and golden tones that occur naturally within the stone

Amethyst has long been associated with February

brown and orange

It is opaque

It may be red

including browns

Green Aventurine

including to ward off illness and the Plague

and much of the black Onyx on the market has been artificially colored

with inclusions of white to colorless translucent or transparent

and those that still exist today have been passed down for generations