Name Iolite Chemical Composition Mg2Al4Si5O18 Chemical Composition (Alternate) (Mg,Fe)4Al8(OH)2(Si2O7)5 Hardness 7.0 to 7.5 Refractive Index 1.53 - 1.54 to 1.54 - 1.55 Bi-refringence 0.001 Optic Sign Negative Optical Character Biaxial Specific Gravity 2.58 to 2.66 Crystalline System Rhombic Only above 1 Kilo Lots of all size
Supplier: Rough gemstones, tumbled gemstones, faceted gemstones, precious and semi precious gemstones, metals, metal ores, metal ore concentrate. also supplier of antimony, lithium, copper, copper cathodes, nickel concentrate and other metals & metal ores.
Supplier: Stone products, gemstones, rough and faceted/cabbed
Supplier: Minerals, crystal, rough gems, facet gems & jewellery
Buyer: Rough gems
Supplier: Facet gemstones rough, gemological identification instruments, lapidary equipment
Supplier: Precious and semiprecious gemstones, we specialise in iolite ( clean rough and facet grade)
Supplier: Rough & faceted gemstone - tourmaline, garnet, peridot, topaz, aquamarine, sapphire, lapis lazuli, moonstone, sapphire, spinel
Supplier: Rough gemstones & faceted gemstones
Supplier: Facet rough emerald