Assertion: telescope's mirror | /r/HasProperty | over-coated
Facets:
value: with hard silicon dioxide
type: OTHER
Source sentences:
text: The large primary mirror and the elliptical secondary mirror of your telescope are front-surface aluminized and over-coated with hard silicon dioxide, which prevents the aluminum from oxidizing.
text: The large primary mirror and the elliptical secondary mirror of your telescope are front-surface aluminized and over-coated with hard silicon dioxide, which prevents the aluminum from oxidizing.