Modifiers matching rock:

• resistant,
• sedimentary,
• loose,
• compact,
• hard,
• difficult,
• virgin,
• volcanic,
• simple,
• isolated,
• friable,
• rich,
• tight,
• metamorphic,
• igneous,
• ingenious,
• light,
• surrounding,
• precious,
• polyphase,
• white,
• colored,
• porous,
• acidic,
• stronger,
• crystalline,
• weaker,
• azonic,
• soft,
• geologic,
• crustal,
• weak,
• native,
• polycrystalline,
• industrial,
• carbonaceous,
• rough,
• siliceous,
• frozen,
• enough,
• competent,
• lightweight,
• chemical,
• decorative,
• related,
• fragmented,
• molten,
• elastic,
• refractory,
• coarse,
• softer,
• underlying,
• base,
• fine,
• unconsolidated,
• planetary,
• dated,
• sharp,
• egyptian,
• natural,
• useful,
• flying,
• magnetic,
• alkaline,
• non-porous,
• harder,
• plutonic,
• angular,
• hot,
• fragile,
• rigid,
• normal,
• heavier,
• typical,
• argillaceous,
• strong,
• eruptive,
• visible,
• refractive,
• vitreous,
• flat,
• intermediate,
• colorful,
• pulverized,
• aluminous,
• lighter,
• reflective,
• large,
• granular,
• sedentary,
• free,
• modern,
• abundant,
• size,
• small,
• soluble,
• combustible,
• acid,
• local,
• sticky,
• heated,
• british,
• terrestrial,
• russian,
• extrusive,
• covered,
• available,
• bituminous,
• salt,
• exotic,
• original,
• red,
• good,
• looking,
• coloured,
• older,
• flinty,
• inert,
• anisotropic,
• powdered,
• smooth,
• unstable,
• heterogeneous,
• ductile,
• stable,
• impenetrable,
• tough,
• korean,
• massive,
• permeable,
• crumbly,
• textured,
• dense,
• deleterious,
• solid,
• suitable,
• impermeable,
• hardest,
• calcareous,
• ordinary,
• metallic,
• dark,
• subsurface,
• smaller,
• primary,
• geological,
• clastic,
• basic,
• abrasive,
• nonporous,
• dry,
• unusual,
• spherical,
• widespread,
• heavy,
• common,
• artificial,
• indigenous,
• marine,
• brittle,
• extraterrestrial,
• crushed,
• barren,
• conductive,
• noble,
• firm,
• opaque,
• insoluble,
• intrusive,
• glassy,
• homogeneous,
• durable,
• new,
• ornamental,
• reactive,
• inappropriate,
• consolidated,
• uniform,
• polished,
• impervious,
• organic,
• traditional,

Simple categories matching crustal:

• process,
• structure,
• rock,
• particulate,
• material,
• metal,
• activity,
• component,
• strip,
• element,
• mineral,
• compound,