SEARCH Articles Figures Tables Black opal Colloidal ‘opal’ templates Common opal Cycl opal Hurricane Opal Inverse opal sensors Inverse opal structures Inverse opals Inverse-opal photonic crystals Inverted opal Japanese opal glass Latex opal Opal formation Opal glass Opal glass-ceramics Opal photonic crystals Opal terminator codon Opals amorphous structure Opals iridescence Opals, self-assembled Photonic inverse opal Photonic natural opals Photonics inverse opals Polymer inverse opal Polymer opal Precious opal Russian Opal Silica inverse opal Silica opal photonic crystals Silk inverse opal Structure of 3DOM Materials (Inverse Opal Structures) Synthetic opals Thin films inverse-opal What produces the colour in opal White opal White opal glass Why Are Opals and Pearls Iridescent