Dendritic Opal 6mm Hexagon - 15-16 Inch Stone Type_Petrified Green is the most common

Green is the most common color for Aventurine

Potato pearls are roundish and slightly irregular in shape

Roman glass that has been turned into contemporary beads refers to ancient Roman glass artifacts (often shards or fragments) that are carefully salvaged

and yttrium

Blue Tiger Eye is a naturally occurring dark stone with chatoyant layers that create a flash which seems to emanate from within the stone as they catch the light

Dendritic Opal 6mm Hexagon - 15-16 Inch Stone Type_Petrified Green is the most commonThis 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.