The arrangement in space of uniform spheres (atoms and molecules in crystals or mineral grains in clastic sedimentary rocks) resulting in a cubic material structure. cubic packing is mechanically unstable, but is more porous packing arrangement, with about 47% porosity in the ideal situation. Most sediments are not uniform spheres the same size, or can be arranged in a cubic structure naturally, so most of the sediments are much less than 47% porosity.
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