A melanocratic rock contains at least 60% dark and heavy ferro-

magnesium Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 of the periodic ta ...

mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. ( ...

s.What is Melanocratic? definition of Melanocratic (Science Dictionary)
dark and heavy ferro-magnesian mineral
accessdate: March 10, 2017

References

Petrology {{geology-stub