Modifiers matching rock:

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

Simple categories matching impermeable:

• material,
• unit,
• substrate,
• condom,
• surface,
• compound,
• formation,
• molecule,
• barrier,
• rock,
• cover,
• particle,
• membrane,
• earth,
• container,
• medium,
• plastic,
• layer,
• covering,
• sphere,
• stone,
• solute,
• coating,
• means,
• area,
• metal,
• deposit,
• polymer,
• region,
• object,
• structure,
• fabric,
• filler,
• substance,
• soil,
• component,
• sheet,
• enclosure,
• sediment,
• wall,
• fluid,
• glove,
• reservoir,
• pavement,
• matter,