Dendritic Opal 3x6mm Heishi - 15-16 Inch rounds_part_four microcrystalline form of Quartz

microcrystalline form of Quartz

Black Tourmaline is a black crystalline aluminum borosilicate mineral with occasional light gray inclusions that appear as flecks or veins

some are smaller and discreet

This later combined with additional silica in the groundwater as well as the minerals that give Mookaite its distinctive colors

but it is opaque as well

Dendritic Opal 3x6mm Heishi - 15-16 Inch rounds_part_four microcrystalline form of QuartzThis 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.