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Pieces measure approximately 45-70mm (AVERAGE SIZE)
where trace amounts of chromium replace aluminum ions in kyanite crystals
or rainbow sheen when polished
Tricolor calcite
Black Obsidian Octagon Coasters (2 Pieces) (3-5 inches) Menu Obelisks Pieces measure approximately 45-70mm (AVERAGEBlack Obsidian Octagon Coasters Uniqueness Guaranteed: Every item is one of a kind, making them ideal for all projects or designs. Origin: India Quantity: set of 2 Size: 3" 5" Obsidian is not a gemstone but a kind of glass that forms when volcanic lava rapidly cools in the open air without forming any specific crystalline structures. Depending on the included minerals, obsidian can occasionally exhibit a gold, silver, or rainbow sheen when polished.
US$ 694.50
US$ 14.95
US$ 11.60
US$ 11.60
US$ 13.15
US$ 34.99
