Jade, obsidian, seashells, shark teeth, jewelery
Obsidian
Mahogany Obsidian
No. Obsidian is brittle.
Obsidian is a felsic glass. At depth, it will crystallize to form granite. On the other hand it turns into perlite on reacting with water. At high grade it recrystallizes to form felsic glass.
Leslie B. Davis has written: 'The Obsidian Cliff Plateau, prehistoric lithic source, Yellowstone National Park, Wyoming' -- subject(s): Petrology in archaeology, Indians of North America, Obsidian, Antiquities, Implements, Obsidian implements
Obsidian is molten silica (read sand) which has cooled rapidly after a volcanic eruption into brittle glass and is the reason why it chips easily into blades. Iron and magnesium give obsidian its dark color.
Yes it is. The Native Americans would walk great distances to collect it.
Jade, obsidian, seashells, shark teeth, jewelery
Obsidian is a naturally occurring volcanic form of glass.
Obsidian
Mahogany Obsidian
No. Obsidian is brittle.
No. Obsidian is natural glass, mostly silica. Obsidian is of volcanic origin.
Obsidian is a felsic glass. At depth, it will crystallize to form granite. On the other hand it turns into perlite on reacting with water. At high grade it recrystallizes to form felsic glass.
Obsidian is, itself, a mineral.
Obsidian is a natural glass.