Obsidian.
the sedementary rock that is black is called hornblende
the sedementary rock that is black is called hornblende
a Black Rock
A black glass-like rock could be obsidian, which is a natural volcanic glass formed from rapidly cooled lava. Obsidian is usually black in color and has a shiny, glassy appearance due to its lack of crystalline structure. It is commonly used in jewelry and decorative objects.
It is commonly called "volcanic glass".
The black rock in the TV show LOST is an old ship, that is called black rock.
There is a black rock band called PAR~A~DIGM There is also The Rocturnals that appears to be black
ash glass rock lava
It is called a Frit, which is the black area around the perimeter of auto glass. It help diffuse sunlight from destroying the adhesive of the windshield. Source Glass.net
The rock you are describing is likely obsidian. Obsidian is a naturally occurring volcanic glass formed during rapid cooling of lava. It is usually black in color and has a smooth, glassy texture.
Obsidian is an extrusive felsic igneous rock.
The name for black glass is obsidian. It is a naturally occurring volcanic glass formed from lava that cools rapidly. Obsidian is typically black in color, but may also have hints of other colors like brown, gray, or green.