Perles en iolite Donuts / disque / heichi Treatments that exist to modify

Treatments that exist to modify chrysocolla:

Number of pearls per row: 30

- Aragonite

soda-lime (oligoclase

Perles en iolite Donuts / disque / heichi Treatments that exist to modifyIolite beads. Color: Dark blue Size: 7 x 8mm Country of origin: Brazil Gemological information about iolite: Possible color: Light to dark blue, gray to colorless purple Real name: Cordierite Density: Between 2. 57 and 2. 66 Hardness: 7. 5 Crystal system: Orthorhombic Fracture: Conchoidal Cleavage: Indistinct Polariscope: Anisotropic Refractive index: Np: 1. 530 to 1. 533 Nm: 1. 535 to 1. 561 Ng: 1. 538 to 1. 563 Birefringence: 0. 006 to 0. 012