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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.
When the magma finally reaches the surface as lava and cools, the rock solidifies around the gas bubbles and traps them inside, preserving them as holes filled with gas called vesicles. A related texture is amygdaloidal in which the volcanic rock, usually basalt or andesite, has cavities, or vesicles, that are filled with secondary minerals, such as zeolites, calcite, quartz, or chalcedony.