Ice Obsidian 13x18mm Rectangle - 8-Inch liquidate_b Rutilated Quartz is a silicon

Rutilated Quartz is a silicon dioxide mineral with unique needle-like inclusions of Rutile

chrysocolla

Shattuckite is a pseudomorph

Opalite can have a blue appearance when placed against a dark background and appear milky white with a pink or orange glow against a light background

Ice Obsidian 13x18mm Rectangle - 8-Inch liquidate_b Rutilated Quartz is a siliconIce Obsidian is a light brown to green to gray volcanic stone. Obsidian is formed when felsic lava cools without crystal growth. It is sometimes used for scalpel blades in cardiac surgery, as Obsidian can be formed into a blade many times sharper than steel surgical blades.