Obsidian is perhaps best known in its role as the dark black blade atop ancient spears and axes ... In this case, the material is microscopic crystals of metallic magnetite, a magnetic mineral; ...

Sotomayor shows his work this weekend at the Pikes Peak Gem, Mineral and Jewelry Show at the Norris-Penrose Event Center. Admission is $5 for a one-day pass or $8 for a multi-day pass.

Since it's born out of molten rock, obsidian is only found in volcanic regions of the world, including in parts of the United States, such as the Mountain West, Southwest, California, Oregon, and ...

Rainbow Obsidian: Molten Earth To A Mesmerizingly Colorful Glassy Rock ... In this case, the material is microscopic crystals of metallic magnetite, a magnetic mineral; ...

The stone at Obsidian Cliff has few inclusions, which means it lacks the presence of mineral crystals that can weaken the stone’s structure, and that contributes to the high quality of the ...

Hundreds of obsidian artifacts have revealed where the Aztecs acquired the volcanic glass they used for tools, ornamental pieces or religious objects centuries ago — and their vast trade ...