Obsidian is a natural glass.
Other names for obsidian is Apache tears, volcanic glass, and Black obsidian.
Mostly from the Aztec city-states of Pachuca and Otumba. Pachuca's greenish obsidian was considered better quality, and was favored, but Otumba's greyish obsidian was also in common demand.
In some very rare instances, obsidian can be nearly colorless, but normally it is brown to black.
Obsidian is a beautiful rock. It's description is pretty simple, it is a rock that formed out of cooled lava, and is black in color.
Coal is non- clastic
It is clastic
clastic
a clastic clause is a prepositional phrase with a verb ending form to make it a clastic clause
is sandstone a clastic
Obsidian is a naturally occurring volcanic form of glass.
Obsidian
Mahogany Obsidian
No. Obsidian is brittle.
Halite (sodium chloride) is not a clastic mineral; it is an evaporite.
They are all Sedimentary
No. Obsidian is natural glass, mostly silica. Obsidian is of volcanic origin.