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Igneous Rocks
Peridotite Rock Type, Composition, Formation, Occurrence & Uses
Peridotite is a group of dense and coarse-grained ultramafic igneous rocks. The rock group contains kimberlite. The group can also ...
Igneous Rocks
Pumice Rock Type, Composition, Formation, Occurrence & Uses
Pumice is an igneous rock that has a light-colored and extremely porous appearance. It has been used in various industries ...
Igneous Rocks
Rhyolite Rock Type, Composition, Formation, Occurrence & Uses
Rhyolite is an extrusive igneous rock with a high silica concentration. The rock is usually pink or gray. The grains ...
Igneous Rocks
Scoria Rock Type, Composition, Formation, Occurrence & Uses
Scoria is a porous and dark-colored igneous rock that may or may not contain crystals. The usual color of scoria ...
Igneous Rocks
Trap Rock, Types, Occurrence & Uses
Trap rock is not a rock, but it is a broad term used to define dark-colored igneous rocks used to ...
Igneous Rocks
Tuff Rock Type, Composition, Formation, Occurrence & Uses
Tuff is an ingenious rock made from ash and sediments eruptions in volcanic explosions. The explosive volcano eruptions eject rocks, ...
Amphibolite Rock Type, Formation, Occurrence & Uses
Amphibolite is a dark-colored, weekly-foliated metamorphic rock that contains plagioclase feldspar and amphibole of the hornblende group. The amphibole is ...
Gneiss Rock Type, Composition, Formation, Occurrence & Uses
Gneiss is a common and widely distributed foliated metamorphic rock. It is identified by its bands and lenses of varying ...
Hornfels Rock Type, Composition, Formation, Occurrence & Uses
Hornfels is a non-foliated and very fine-grained metamorphic rock with a variable composition. It is a very hard rock with ...
Lapis Lazuli Rock Type, Composition, Formation, Occurrence & Uses
Lapis Lazuli, or lapis, is one of the oldest spiritual stones known to mankind. It has been used by healers, ...
