Modifiers matching rock:

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

Simple categories matching tough:

• stain,
• material,
• application,
• toy,
• state,
• spice,
• food,
• seed,
• situation,
• fruit,
• appendage,
• hardwood,
• surface,
• substance,
• paper,
• structure,
• hide,
• junk,
• plant,
• sheet,
• vegetable,
• resin,
• polymer,
• perennial,
• meat,
• soil,
• bronze,
• solid,
• grass,
• plastic,
• stuff,
• subject,
• metal,
• area,
• wood,
• textile,
• condition,
• location,
• veggie,
• exercise,
• substrate,
• tile,
• item,
• workwear,
• tissue,
• rock,
• leaf,
• contaminant,
• fabric,
• coating,
• industry,
• shrub,
• case,
• job,
• part,
• stone,
• fiber,
• annual,
• animal,
• group,
• decision,
• fibre,
• iron,
• topic,
• object,
• times,
• thing,
• residue,
• fish,
• alloy,
• issue,
• vine,
• herb,