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Ophitic texture-An olivine gabbro that contains cumulate olivine and plagioclase in a matrix of intercumulate pyroxene and magnetite (black) that crystallized from trapped intercumulate liquid.
Basalt may also contain olivine, quartz, hornblende, nepheline, orthopyroxene, etc. Basalt is a volcanic equivalent of gabbro. Basalt is a fine-grained and dark-colored rock. Black color is given to basalt by pyroxene group mineral augite. Width of the sample is 12 cm.