Lherzolite Rock Composition and Occurrence
Lherzolite is a coarse-grained ultramafic rock with 40-90% olivine. Ultramafic rocks have less than 45% silica (SiO2) and more than 90% mafic minerals. Mafic minerals
Phaneritic
What Are Harzburgite Rocks and How Do They Form?
Harzburgite is a coarse-grained, dark-colored ultramafic plutonic rock. It has mainly olivine, orthopyroxene, and a small amount of clinopyroxene. Ultramafic rocks are low in silica
Troctolite – The Trout looking-like Mafic Rock
Troctolite is a coarse-grained intrusive igneous rock. It has mainly variable amounts of olivine, calcic plagioclase, and minor pyroxene. Its composition lies between anorthosite, where
A Complete Latite Rock Guide
Latite is an intermediate volcanic or extrusive rock. It has a fine-grained texture and is often porphyritic. This rock has nearly equal plagioclase and alkali
A Must-Read Comprehensive Guide to Norite Rock
Norite is a coarse-grained, dark-colored plutonic rock. It has mainly calcium-rich plagioclase (= labradorite to bytownite) and orthopyroxene (= hypersthene or enstatite) with minor hornblende,
What You Must Know about Monzonite Rocks
Monzonite is a coarse-grained, intermediate intrusive igneous rock. Its composition lies between diorite and syenite and has roughly equal amounts of plagioclase and alkali feldspar.
What Experts Will Tell You about Granodiorite Rock
Granodiorite is a coarse-grained, light-colored plutonic rock. It has mainly plagioclase, quartz, lesser alkali feldspar, and minor amounts of mafic minerals like mica and amphibole.
Tonalite: Key Things to Learn this Granitoid
Tonalite is a coarse-grained, light-colored, plutonic or intrusive rock. Its composition is mainly plagioclase, quartz, and small amounts of biotite, hornblende, and sometimes pyroxenes. Also,
A Geologist’s Definitive Guide to Granite Rock
Granite is a coarse-grained, light-colored, plutonic, or intrusive igneous rock. It is dominated by alkali feldspar, quartz, and plagioclase, with other minerals like amphibole, mica,