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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.
The texture and structure of chemogenic rocks are characterized by the development of crystalline grains of various sizes. For sizes less than ue.Ã¼ 0ue1, 0Ã¼1 mm the grains are not visible even under; a microscope such a texture is called amorphous. or colloidalexture and structure of igneous rocks. The texture of igneous rocks depends on the composition of the magma and the conditions surrounding the magmaâs cooling. The textures are different in intrusive, vein, and extrusive rocks.