Baretti: A dictionary of the English and Italian languages
Speculáre, adj. Pietra —, scagliola marble.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
speculare: to speculate, to espie into, to contemplate, to obserue or consider diligently. Also to see afarre off, or watch from an high tower. Also a glasse or talke-stone. Also a Lookeing-glasse-maker.