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.
Obsidian is also known as volcanic glass. It's classified as a fine-grained extrusive igneous rock.
Obsidian rock is found in the cooled lava that cools almost instantly.
dig near a volcano.
In the center of the Earth.
pacific coast
Mahogany obsidian
where was obsidian made
Obsidian is a naturally occurring volcanic form of glass.
Obsidian is a fairly common and has little collector value. The only Obsidian that has a bit more value is Rainbow Obsidian. Which is still fairly common.
obsidian is smooth but not basalt
obsidian obsidian
Yes the Obsidian does cool quickly and the vesicular basalt
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, itself, a mineral.
Obsidian is a natural glass.
Neither, obsidian is a glass.
yes obsidian is a crystal.
Obsidian is an igneous rock.
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.
Yes, they are only found rarely.