Modifiers matching rock:

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

Simple categories matching insoluble:

• macromolecule,
• salicylate,
• lubricant,
• material,
• substance,
• bubble,
• alcohol,
• portion,
• precipitate,
• component,
• system,
• object,
• compound,
• liquid,
• particle,
• chemical,
• aggregate,
• fiber,
• contaminant,
• deposit,
• fraction,
• matter,
• solvent,
• acceptor,
• nutrient,
• shell,
• product,
• ester,
• protein,
• fertiliser,
• item,
• constituent,
• polymer,
• conductor,
• solid,
• oligosaccharide,
• carbohydrate,
• rock,
• phosphorus,
• complex,
• gas,
• impurity,
• salt,
• filler,
• cement,
• builder,
• molecule,
• drug,
• monomer,
• residue,
• medium,
• resin,
• halide,
• oxide,
• thing,
• fibre,
• phosphate,
• substrate,
• hydroxide,
• surface,
• contamination,
• sediment,
• mercury,
• form,
• electrode,
• matrix,
• coating,
• powder,
• sulphide,
• spinel,
• pollutant,
• polysaccharide,
• metal,
• lipid,
• carrier,
• sugar,
• mineral,
• particulate,
• fluoride,
• structure,
• fertilizer,
• metabolite,
• abrasive,
• soil,
• waste,
• solute,
• scaffold,