Modifiers matching rock:

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

Simple categories matching insoluble:

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