Well it is a tool/rock made from volcanic glass. The Aztec used it a lot to build statues and shelter.
Obsidian is well suited to 'flaking" or "napping" which is the art of creating a sharp edge.
Obsidian will flake down to a molecular edge, being a type of naturally occurring glass it is high on the hardness scale.
Even today, some surgical scalpel tips are fabricated from obsidian.
The igneous rock you are describing is likely obsidian. Obsidian is a naturally occurring volcanic glass formed from the rapid cooling of molten lava. Its smooth, glassy texture and black color make it a popular material for decorative items and tools.
a black bear
The black widow is the only spider in Georgia known to resemble a black widow but be entirely black. If you spot a black spider in Georgia that looks similar to a black widow but is completely black, it is likely a black widow spider. While rare, variations in color can occur within the species.
Labradors are yellow, brown, black, and grey when they are over 4 years of age.
Black lions do not exist. Black leopards and black jaguars, however, do exist.
One type of obsidian is snowflake obsidian, which is black with white mineral inclusions that resemble snowflakes.
Other names for obsidian is Apache tears, volcanic glass, and Black obsidian.
The origin is from medievil english. By the way, obsidian is a black mineral.
Obsidian is black glass formed by volcanoes.
Not yet.
obsidian rocks are red and black also sometimes orange
Obsidian.
It is obsidian.
BLACK dumb nut
Obsidian is volcanic glass and is found in several colours including - black, grey, dark green, red, yellow and pink. mostly black It is also very sharp; it can be used to make knives
In some very rare instances, obsidian can be nearly colorless, but normally it is brown to black.
Obsidian is a type of black glass.