Igneous Rocks:

* Intrusive (formed underground):

* Granite: Commonly found in countertops, granite is a coarse-grained rock with visible quartz crystals.

* Gabbro: A dark-colored, coarse-grained rock often used in road construction.

* Diorite: A medium-grained rock with a speckled appearance.

* Extrusive (formed above ground):

* Basalt: A dark-colored, fine-grained rock common in volcanic areas.

* Rhyolite: A light-colored, fine-grained rock that can be glassy in appearance.

* Pumice: A light and porous rock formed from volcanic ash.

Sedimentary Rocks:

* Clastic (formed from fragments of other rocks):

* Sandstone: Formed from sand grains cemented together.

* Conglomerate: Formed from rounded pebbles cemented together.

* Shale: Formed from compacted clay and mud.

* Chemical (formed from precipitation of minerals):

* Limestone: Formed from the accumulation of shells and other marine life.

* Rock Salt: Formed from the evaporation of salty water.

* Organic (formed from the remains of organisms):

* Coal: Formed from the accumulation and compaction of plant matter.

Metamorphic Rocks:

* Foliated (have a layered appearance):

* Slate: A fine-grained metamorphic rock that splits easily along flat planes.

* Schist: A metamorphic rock with visible mineral grains arranged in layers.

* Gneiss: A metamorphic rock with distinct banding of light and dark minerals.

* Non-foliated (don't have a layered appearance):

* Marble: A metamorphic rock formed from limestone.

* Quartzite: A metamorphic rock formed from sandstone.

* Anthracite: A hard, black metamorphic rock formed from coal.