Perles en iolite facettée entre 2 et 7mm Sizes:2mm Chelsea Filter: No modification

Chelsea Filter: No modification

Cleavage: Indistinct

feldspar: about 1

Different countries where rock crystal is perhaps extracted: Switzerland

Perles en iolite facettée entre 2 et 7mm Sizes:2mm Chelsea Filter: No modificationFaceted iolite beads. Color: Dark blue Sizes between 2 and 7mm 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.