The word "igneous" comes from the Greek word for fire. Two other igneous rocks are Basalt dark grey to black, and Gabbro dark grey to black.
Obsidian is part of the Granite family of igneous rocks.
Obsidian and Granite are both igneous rocks so unless the Obsidian rock goes back into the magma and cools slower it can possibly form into granite.
Basalt and pumice.
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
Basalt and rhyolite are examples of extrusive igneous rocks. Also, pumice, scoria, obsidian, tuff, ignimbrite,....
Obsidian is part of the Granite family of igneous rocks.
Granite is a coarse grained igneous rock without Pyroxene.
They are all Igneous rocks.
Igneous rocks
Obsidian and Granite are both igneous rocks so unless the Obsidian rock goes back into the magma and cools slower it can possibly form into granite.
Basalt and pumice.
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
Basalt and rhyolite are examples of extrusive igneous rocks. Also, pumice, scoria, obsidian, tuff, ignimbrite,....
These are all formed by volcanic activity. Igneous
Granite, Basalt, Gabbro, and Obsidian
Granite basalt pumice aplite scoria
The Native Americans used the Igneous rock Obsidian as arrowheads. Granite is used as countertops and sculptures.