greenschist
greenschist A low-grade, regional metamorphic rock, containing abundant chlorite with albite, epidote, and sericite, and possessing a distinct cleavage. Greenschists form by metamorphism of basic igneous rocks, the chlorite component being derived from the ferromagnesium minerals present in the original rock. Chlorite imparts a green colour to the cleaved rock, hence the name ‘greenschist’.
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Greenstone , greenstone A low-grade, regional metamorphic rock containing actinolite, epidote, and albite, and lacking a cleavage. Greenstones form by metamorphis… Iron Ores , Rocks
Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m… Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… Rock , rock1 / räk/ • n. 1. the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underly… Basic Rock , basic rock Rock with a relatively high concentration of iron, magnesium, and calcium, and with 45–53% of silica by weight. Examples include gabbro, w… Metamorphic Rocks , Metamorphic rock is rock that has changed from one type of rock into another. The word metamorphic (from Greek) means “of changing form.” Metamorphic…
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greenschist