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Common opal is distinguished from noble opal by its construction
This figure
ne rétablit pas)
Clivage: Indistinct
The 108 blue apatite (54) and howlite (54) beads are 6mm
Perles en cristal de roche facettées entre 2 et 4mm Sizes:2mm Common opal is distinguished fromFaceted rock crystal beads. Color: Colorless (more or less inclusive) Sizes between 2 and 4mm Country of origin: Brazil Gemological information on rock crystal: Possible color: Colorless, may be heavily included which gives it a whitish appearance Density: 2. 65 Hardness: 7 Crystal system: Trigonal Fracture: Conchoidal, irregular Cleavage: None Polariscope: Anisotropic, restores every 90 Refractive index: No: 1. 539 to 1. 550 Ne: 1. 549 to 1. 557
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