Modifiers matching crystal:

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

Simple categories matching optic:

• flow,
• device,
• structure,
• equipment,
• material,
• crystal,
• surface,
• phenomenon,
• system,