Perles en spinelle noir entre 4 et 8mm Sizes:4mm Different countries where chalcedony can

Different countries where chalcedony can be extracted: Italy

Gemological information on microcline: Note: Part of the feldspa family

Note: These are the inclusions of epidote

Forme: Galet / nuggets de plus grande taille

Family: Microcrystalline Quartz

Perles en spinelle noir entre 4 et 8mm Sizes:4mm Different countries where chalcedony canSpinel beads. Color: Black Sizes between 4 and 8mm Country of origin: Thailand Gemological information on spinel: Possible color: Black, blue, pink, red, purple, green, yellow, orange Density: 2. 65 Hardness: 7 Crystal system: Cubic Fracture: Conchoidal Cleavage: None Polariscope: Anisotropic (restores all 90, except in the optical axis) Refractive index: n0: 1. 538 to 1. 544 ne: 1. 547 to 1. 553 Birefringence: 0. 009 Chelsea Filter: Inert to reddish