Modifiers matching crystal:

• optic,
• natural,
• valuable,
• optical,
• single,
• beautiful,
• abrasive,
• polished,
• blue,
• inorganic,
• pure,
• solid,
• synthetic,
• simple,
• transparent,
• red,
• cubic,
• suitable,
• piezoelectric,
• atomic,
• hard,
• covalent,
• colloidal,
• regular,
• birefringent,
• set,
• monatomic,
• strong,
• fat,
• colored,
• important,
• mysterious,
• large,
• model,
• rare,
• irish,
• basic,
• elemental,
• full,
• typical,
• brittle,
• durable,
• common,
• new,
• industrial,
• individual,
• electronic,
• thick,
• anisotropic,
• clear,
• larger,
• raw,
• bound,
• ionic,
• refractive,
• disordered,
• small,
• elongated,
• artificial,
• everyday,
• colorful,
• harder,
• nonlinear,
• perfect,
• molecular,
• dark,
• healing,
• familiar,
• metallic,
• flat,
• electric,
• symmetric,
• yellow,

Simple categories matching optical:

• means,
• transformation,
• instrument,
• property,
• disk,
• parameter,
• system,
• material,
• munition,
• part,
• shutter,
• assembly,
• irregularity,
• interaction,
• crystal,
• appliance,
• command,
• energy,
• surface,
• communication,
• error,
• windows,
• display,
• imperfection,
• equipment,
• detector,
• medium,
• interferometer,
• coupler,
• structure,
• device,
• condition,
• market,
• sensation,
• field,
• activity,
• component,
• process,
• entity,
• fibre,
• point,
• defect,
• drive,
• phenomenon,
• carrier,
• signaling,
• consideration,
• resin,
• substrate,
• interference,
• elements,
• glasses,
• plate,
• magazine,
• sensor,
• base,
• observation,
• measure,
• power,
• experiment,
• texture,
• portion,
• section,
• case,
• wave,
• article,
• distortion,
• lens,
• circuit,
• artifact,
• amplifier,
• devices,
• product,
• image,
• characteristic,
• procedure,
• constant,
• disorder,
• hardware,
• disc,
• perturbation,
• penalty,
• pathology,
• pattern,
• catalyst,
• figure,
• details,
• mode,
• attribute,
• quality,
• layer,
• waveguide,
• aberration,
• effect,
• unit,
• implementation,
• radiation,
• particle,
• data,
• force,
• module,
• object,
• film,
• disease,
• filter,
• performance,
• dielectric,
• measurement,
• machine,
• network,
• glass,
• reader,
• item,
• correction,
• sheet,
• switch,
• losses,
• fiber,
• input,
• substance,
• apparatus,
• communications,
• deflector,
• processing,
• reflector,
• lense,
• marker,
• quantity,
• contrivance,
• coating,
• coupling,
• solution,
• indicator,
• application,
• paraphernalia,
• concept,
• impression,
• instrumentation,
• information,
• feature,
• value,
• function,
• block,
• element,
• state,
• scopes,