Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch 9mm Rutilated Quartz is a silicon

Rutilated Quartz is a silicon dioxide mineral with unique needle-like inclusions of Rutile

from which its name was derived

veins and brecciated patterns

with a Mohs Hardness of 8

These mines are also famous for sourcing North-American Jasper

Madagascar Green Dendritic Opal 8mm Round - 15-16 Inch 9mm Rutilated Quartz is a siliconThis 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.