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green and purple)
- Magnesite
Number of pearls on a row of 4
L'effet iridescent est lié à la présence d'inclusions: hématite
irregular to splintery Cleavage: 2 cleavages at more or less 90° Polariscope: Anisotropic (difficult to observe) Refractive index: Np: 1
Perles en iolite entre 6 et 10mm IU Sizes:6mm green and purple)Iolite cordierite beads. Color: Pale blue Sizes: Between 6 and 10mm Country of origin: India 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:
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