Modifiers matching rock:

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

Simple categories matching geologic:

• phenomenon,
• occurrence,
• hazard,
• deposit,
• material,
• fabric,
• equipment,
• repository,
• control,
• formation,
• layer,
• entity,
• process,
• complexity,
• event,
• force,
• variable,
• age,
• property,
• upheaval,
• condition,
• rock,
• reservoir,
• consideration,
• feature,
• information,
• activity,
• location,
• investigation,
• oddity,
• time,
• object,
• disaster,
• source,
• structure,
• attribute,
• agent,
• characteristic,
• unit,
• system,
• change,
• piece,
• contact,
• medium,