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Cristobalite
This figure
Birefringence: 0
irregular to splintery
Perles en oeil de faucon entre 2 et 10mm pêche contact me on social networksHawk's eye beads. Color: Blue on black background, dark. Shimmering reflections. Sizes between 2 and 10mm Country of origin: South Africa Gemological information on hawk's eye: Possible colors: Blue, dark blue, blue gray to blue black. Silky, shimmering reflections Density: Between 2. 58 and 2. 66 Hardness: 7 Crystal system: Trigonal, Quartz pseudomorph after unaltered crocidolite Breakage: Irregular Cleavage: None Polariscope: Anisotropic (but
