SILICIC ACID • DICTIONARY ONE.COM • Definition of Silicic acid

... period ending in the thirteenth century, are represented by the contents of some twenty cases. The first three of these receptacles bear no dates. The ornaments which they contain are of bronze, amber, silver, and glass (the latter having become converted into opalescent silicic acid), and were found in Praeneste (modern Palestrina, Italy), and in the territory which was ancient Etruria. Case No. 4 bears date 700 B.C., and here is a rich treasure of primitive Etruscan and Phoenician ...

— Scientific American, Volume XXXVI., No. 8, February 24, 1877 • Various