poikilitic
poikilitic Applied to the texture produced when several orientated or unorientated crystals are enclosed within a larger crystal in an igneous rock. The larger crystals have more widely separated nuclei than the enclosed crystals, and may grow faster, thus enclosing surrounding grains. Where augite encloses a number of plagioclase feldspar crystals the poikilitic texture is given the specific name of ‘ophitic texture’.
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Geodes are hollow rock masses that are lined with crystals that have grown toward the center of the cavity. Geodes are usually roughly spherica… Hornfels , Hornfels is a fine-textured metamorphic rock formed by contact metamorphism . Contact metamorphism occurs when a mass of hot magma intrudes into pree… xenolith , xenolith An inclusion or enclave of a preexisting rock in an igneous rock. Xenoliths are often derived from the country rocks that have been invaded… macrobiota , macrobiota(macrofauna, macroflora) A general term for the larger soil organisms which may be hand-sorted from a soil sample. ‘Macrofauna’ in particul…
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poikilitic