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Gabbro
2005-05-26 11:00:22

Gabbro is a dark, coarse-grained, intrusive igneous rock chemically equivalent to basalt. It is a plutonic rock, formed when molten magma is trapped beneath the Earth's surface and cools slowly into a hard, coarsely crystalline mass. It is dense, greenish or dark-colored and contains varied percentages of plagioclase feldspar, pyroxene, amphibole, and olivine (called olivine gabbro when olivine...

Word of the Day
quilisma
  • In medieval musical notation, a sign or neume denoting a shake or trill.
The word 'quilisma' comes from a Greek word meaning 'a roll'.