Purple Dendritic Opal 6mm Round - 15-16 Inch Color_Clear meaning that it has lustre

meaning that it has lustre and some translucency without the fire or color play associated with precious opal varieties

Moonstone occurs in naturally in shades of white

the other being Diamond

black with snowflake patterns

Pietersite is composed of Tiger Eye

Purple Dendritic Opal 6mm Round - 15-16 Inch Color_Clear meaning that it has lustreThis 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.