Blue Apatite Faceted Microbead NecklaceDozens of tiny faceted beads, each one a sliver of teal blue mineral light, strung collar length. Blue Apatite is a calcium phosphate, Ca5(PO4)3(OH,F,Cl), Mohs 5. The microbead cut amplifies the stone's relatively high refractive indexeach bead's facets catch and scatter light individually, so the full necklace reads as a shimmer rather than a flat color. Gem quality blue Apatite is found primarily in Brazil and Madagascar; its teal color is produced