Category Nuances for shale:

• metamorphic,
• geological,
• soft,
• elastic,
• sedimentary,
• carbonaceous,
• siliceous,
• common,
• raw,
• harder,
• polyphase,
• marine,
• igneous,
• impermeable,
• weak,
• nonmetallic,
• flat,
• difficult,
• anisotropic,
• larger,
• dry,
• proper,
• weaker,
• hard,
• lightweight,
• primary,
• argillaceous,
• granular,
• natural,
• porous,
• specified,
• unconsolidated,
• expensive,
• basic,
• deleterious,
• extraneous,
• consolidated,
• crustal,
• harmful,
• red,
• fissile,
• indigenous,
• loose,
• impervious,
• iron,
• uniform,
• tight,
• older,
• ductile,
• heavy,
• aggregate,
• earthen,
• subsidiary,
• broken,
• inorganic,
• crushed,
• earthy,
• sedentary,
• sharp,
• costly,
• industrial,
• mobile,
• firm,
• calcareous,
• permeable,
• foreign,
• noncombustible,
• friable,
• residual,
• clastic,
• available,
• original,
• geologic,
• competent,
• insoluble,
• manufactured,
• powdered,
• volcanic,
• bituminous,
• black,
• solid,
• ceramic,
• finer,
• fine,
• resistant,
• textured,
• terrestrial,
• native,
• intermediate,
• slippery,
• softer,
• traditional,
• refractory,
• size,
• underlying,
• fragile,
• unstable,

Simple Categories for shale:

• contaminant,
• aggregate,
• material,
• particle,
• rock,
• stone,
• deposit,
• constituent,
• substrate,
• component,
• sediment,
• residue,
• mineral,
• matter,
• unit,
• substance,