Dendritic Black Opal 8mm Round - 15-16 Inch L02 In lower grades it can

In lower grades it can be transparent to opaque and is commonly light blue

rainbow effect of light refracting off of the air bubbles inside of the stone

is aptly named for its shades of gold

producing the effect of the stone seeming to shine from within

the brown spaces creating new continents aside the unfamiliar oceans

Dendritic Black Opal 8mm Round - 15-16 Inch L02 In lower grades it canThis 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.