Rocks

Igneous Rocks

Diorite Rock Type, Composition, Formation, Occurrence & Uses

Diorite is a coarse-grained intrusive igneous rock. Its composition is in-between granite and basalt. The rock is usually found as ...

Igneous Rocks

Gabbro Rock Type, Composition, Formation, Occurrence & Uses

Gabbro is an intrusive igneous rock with a black or dark-green appearance. The term “Gabbro” was first used in the ...

Igneous Rocks

Obsidian Rock Type, Composition, Formation, Occurrence & Uses

Obsidian is an igneous rock. It is an amorphous material, commonly known as a mineraloid. The rock is formed when ...