lutita 54
Sust. FEM. Sedimentary rock composed of clay and silt deposits. Porous, permeable little, is due to insufficient communication between holes, often rolled thin, fissile, layers of varied shades of colors: black, grey, bluish, yellowish, whitish, reddish, greenish grey. The very dark contains abundant organic matter. It is called bituminous shale. It may contain oil and natural gas ( lutigas ) in usable quantities. By metamorphism becomes in Slate and phyllite. Its name derives from the latin «lutum»: mud, mud, silt, mud, silt, and 'ita' suffix: common rocks and minerals.
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