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

Mica with a silvery appearance.

Russian mica in thin transparent plates.

A sparkling stone mentioned by the ancients; perhaps yellow micaceous schist, or the sand from it.

(German katzengold Swedish kattguld), a yellowish variety of mica (cf. cat-silver, n.).

Pinite, a form of mica pseudomorphous after scapolite. Formerly also: †scapolite itself (obsolete).

Mineralogy. Any of various minerals resembling mica in appearance, esp. a variety of ottrelite or chloritoid. Now rare.

A hydrous potash mica, with pearly lustre, occurring in small yellowish scales.

A vanadium-containing mineral of the mica group, occurring as minute greenish or brownish scales.

= micarelle, n.

A combination of mica with hornblende-picrite.

A rare colourless mica containing lithium and magnesium but without essential aluminium.