What is an extrusive igneous rock that is actually glass?

Answer 1

One type of glassy igneous rock is obsidian, which is black and glass-like. Any type of igneous rock that is glassy would be a extrusive rock, which means it was formed outside the earths crust and cooled quickly, making for a fine grain and small crystals. hope this helps

Answer 2

Obsidian is an extrusive igneous rock that forms when lava cools quickly and solidifies into a glass-like material without crystal formation. It is typically black in color and has a smooth, glassy texture due to its rapid cooling process.

Answer 3

There are different types of igneous rocks that are actually glass and three of them are obsedian, pumice and scoria. These all are extrusive igneous rocks that are glass.

Answer 4

It is referred to as mafic.

Answer 5

Obsidian.

Answer 6

Obsidian.

Answer 7

Obsidian