IGNEOUS ROCKS!

Basalt: A fine-grained igneous rock that is usually black in color.

Diorite is a coarse-grained, intrusive igneous rock.

Gabbro is a dark-colored coarse-grained intrusive igneous rock.

Granite is a coarse-grained, light-colored, intrusive igneous rock.

Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material. It cools so rapidly that crystals do not form.

Pegmatite is a light-colored, extremely coarse-grained intrusive igneous rock. It forms near the margins of a magma chamber during the final phases of magma chamber crystallization. 

Pumice is a light-colored vesicular igneous rock Pumice is a light-colored vesicular igneous rock. It forms through very rapid solidification of a melt. The vesicular texture is a result of gas trapped in the melt at the time of solidification. 

Rhyolite is a light-colored, fine-grained, extrusive igneous rock that typically contains quartz and feldspar minerals. 

Fire Opal is sometimes found filling cavities in rhyolite.

Scoria is a dark-colored, vesicular, extrusive igneous rock Scoria is a dark-colored, vesicular, extrusive igneous rock. The vesicles are a result of trapped gas. It often forms as a frothy crust on the top of a lava flow or as material ejected from a volcanic vent and solidifying while airborne. 

Welded Tuff is a rock that is composed of materials that were ejected from a volcano, fell to Earth, and then solidified into a rock. It is usually composed mainly of volcanic ash and sometimes contains larger size particles such as cinders. 

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