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Duotone bay — asphalt brief on the left, yellow-folded service sheet on the right.
hardness 6
The pyramid form is cut and polished by hand
igneous pegmatites
relaxation
The iron content of those ancient sediments was exposed to oxygen as the sea retreated
Black Tourmaline Sphere Polished Size:2"D hardness 6A perfect black sphereopaque, cool, dense in the hand, the mineral's striations visible as faint lines in direct light. Black Tourmaline (Schorl) is a boron silicate mineral in the Tourmaline group, Mohs 77. 5, its black color produced by high iron content in the complex crystal structure. Polishing a sphere from Tourmaline requires navigating the mineral's natural cleavage planes; the finished sphere reveals the stone's internal striations across its