the interior polished smooth

Agate is a microcrystalline variety of quartz—chalcedony deposited in fine concentric bands as silica-rich water filled a cavity in volcanic rock layer by layer

Its black color reflects high iron content

Major deposits are found in India

most commercial citrine is amethyst or smoky quartz that has been heated to 400–500°C

Hematite Faceted Microbead Necklace STRESS RELIEF the interior polished smoothEach tiny bead throws a silver flasha necklace that reads as metallic but is entirely stone. Hematite is iron oxide (FeO), Mohs 5 to 6, with a naturally high metallic luster that faceting amplifies to near mirror quality. Faceted hematite microbeads catch and redirect light in a way no smooth bead can replicate, producing a rippling, silvery effect along the strand. Despite its dense, heavy character when handled as a sphere or large piece, microbead