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a banded Chalcedony that is predominantly white with layers of brown
Rhyolite has a non to crystalline composition similar to granite but with a smaller grain size
however they are not currently sourced from that particular region
deep-blue copper mineral produced by weathering of copper ore deposits
Blue Tourmaline 4mm Round Faceted - 15-16 Inch Microfaceted Rounds a banded Chalcedony that isBlue Tourmaline ranges in color from green to blue to yellow to green with black, milky white and clear, colorless inclusions. It is an aluminum borosilicate mixed with iron, magnesium and other metals that give it its color. Tourmaline occurs in nearly every color in the rainbow and its name derives from turmali, the Sinhalese word for mixed color precious stone. Tourmaline is unusual in that it is both pyroelectric and piezoelectric, meaning it
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