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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, ...
Marble Rock Type, Composition, Formation, Occurrence & Uses
Marble is a non-foliated metamorphic rock frequently used worldwide in various applications. Very few rocks have so many uses as ...
Mariposite Rock Type, Composition, Formation, Occurrence & Uses
The word Mariposite is often used to identify green micas colored by small amounts of chromium. Mariposite is also used ...
Sedimentary Rocks
Shale Rock Type, Color, Composition, Formation, Occurrence, & Uses
Shale is an abundant, fine-grained, clastic sedimentary rock. The rock forms when silt and clay-sized mineral particles compress. Its composition ...
