If most of the grains are quartz and feldspar then the overall appearance of the rock will be light, while the opposite will be true if the minerals are mainly mica, pyroxene, amphibole or olivine. The colour of a rock with between 25 and 50% dark minerals is intermediate.
Full Definition of DISPLACE. transitive verb. 1. b: to remove from an office, status, or job c obsolete: to drive out: banish.2. b: to take the place of (as in a chemical reaction) : supplant. â disÂ·placeÂ·able \-ËplÄ-sÉ-bÉl\ adjective. See displace defined for English-language learners. See displace defined for kids.isplace implies an ousting or dislodging. supplant implies either a dispossessing or usurping of another's place, possessions, or privileges or an uprooting of something and its replacement with something else. supersede implies replacing a person or thing that has become superannuated, obsolete, or otherwise inferior.
Distribute, dispense apply to giving out something. Distribute implies apportioned, individualized giving, especially of something that is definite or limited in amount or number: The prizes were distributed among ten winners. Dispense formerly implied indiscriminate, general, and liberal giving, especially of something that was more or less indefinite or unmeasured in amount: to dispense largess. It now applies chiefly to giving according to need or deserts, from an organized and official source: to dispense medicines and food to the victims.