Modifiers matching rock:

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

Simple categories matching opaque:

• fiber,
• imperfection,
• material,
• object,
• paint,
• system,
• paper,
• contaminant,
• stone,
• product,
• film,
• surface,
• creature,
• ink,
• gemstone,
• symbol,
• liquid,
• item,
• gem,
• adhesive,
• substrate,
• structure,
• substance,
• coating,
• bag,
• cell,
• particle,
• document,
• obstacle,
• picture,
• fence,
• container,
• sunscreen,
• copy,
• conductor,
• matrix,
• part,
• medium,
• sheet,
• layer,
• mark,
• aggregate,
• solid,
• assembly,
• fluid,
• sack,
• pigment,
• oxide,
• glass,
• filler,
• content,
• image,
• tissue,
• powder,
• web,
• foodstuff,
• body,
• fabric,
• barrier,
• component,
• beverage,
• article,
• ingredient,
• metal,
• matter,
• plastic,
• obstruction,
• mineral,
• language,
• rock,
• original,