(after Latin specularis lapis), a transparent or semi-transparent substance formerly used as glass or for ornamental purposes; a species of mica…

A substance (perhaps fluorspar) of which precious vases and other vessels were made. Cf. murrhine, adj. n.

In popular and commercial use, (loosely) applied to (or including) mica, n. or Muscovy glass.

A name given to mica, from its resembling in appearance some kinds of isinglass.

Any of a group of monoclinic minerals which are composed of hydrous aluminosilicates of sodium, potassium, magnesium, etc., and occur as minute…

the mineral muscovite, esp. as used to make translucent windows; = muscovite, n.2 Now chiefly historical.

A pale, translucent, potassium-containing mineral of the mica group, KAl2(Si3Al)O10(OH)2, occurring in many rocks. Also called white mica.

A proprietary name for vitreous silica.

Of or belonging to, consisting or composed of, glass; of the nature of glass; glassy. vitreous silica, an amorphous, translucent or transparent form…

The name of a transparent material serving as a substitute for glass.