Obsidian is an igneous rock.
Obsidian is an extrusive igneous rock, formed from rapidly cooling lava.
Igneous: * Obsidian * Granite * Diorite * Gabbro * Pumice * Basalt Metamorphic: * Slate * Phyllite * Gneiss * Mica schist * Marble * Quartzite * Granulite Sedimentary: * Limestone * Sandstone * Shale * Chert * Mudstone * Chalk
Osidian is a igneous rock
igneous, sedimentary, metamorphic
Igneous
igneous
sedimentary
sedimentary
igneous is black and smooth metamorphic is magnetic and sedimentary is used as cement
Igneous Rocks,Sedimentary Rocks,Metamorphic Rocks.
Metamorphic rocks can form from both igneous and sedimentary rocks
Metamorphic rocks can form from both igneous and sedimentary rocks