melanocratic
melanocratic Applied to igneous rocks whose colour index is between 60 and 90. The high colour index of such rocks is due to the presence of a high proportion of ferromagnesian minerals.
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Index Fossil , index fossil (index species, zone fossil) Fossil whose presence is chosen to denote the zone in which it occurs and after which the zone is named. In… Moisture Index , Skip to main content
moisture index Cephalic Index , cephalic index n. a measure of the shape of a skull, commonly used in craniometry. Iron Ores , Rocks
Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m… 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… Felsic , Geologists sometimes find it useful to classify igneous rocks based on color. Because color is sensitive to minor chemical differences it is not a ve…
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melanocratic