| http://www.w3.org/ns/prov#value | - The materials for the first and second reflecting surfaces 26 and 27 and for the spacer stratum 28 may be drawn from glasses, insulators, semiconductor materials such as silicon and germanium, metals such as aluminum, or other materials such as magnesium fluoride, zinc sulfide, calcite, sapphire, and oxides of aluminum, silicon, germanium, calcium, cadmium, titanium, cerium and zirconium.
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