Vivianite Crystal Specimen from Ukraine TF2677 chrome chalcedony where individual atoms arrange themselves

where individual atoms arrange themselves into a repeating lattice structure

Pink opal is relatively more opaque compared to other opals

Composed of magnesium iron aluminum cyclosilicate

Obsidian T-Rex Carving

Weight: 115 grams

Vivianite Crystal Specimen from Ukraine TF2677 chrome chalcedony where individual atoms arrange themselvesVivianite Crystal Specimen from Ukraine Approx. Dimensions: 2. 5x2x1 inches Approx. Weight: 31. 2 grams Locality: Kamysh Burun, Kertch, Crimea, Ukraine This vivianite specimen from Kerch, Ukraine features the minerals characteristic deep blue to blue green coloration, often darkening with exposure to light. Vivianite is an iron phosphate known for its vitreous to pearly luster and bladed or prismatic crystal forms, and specimens from Kerch are valued