Usage examples (12)

• Stone-age; and, somewhat curiously, the locality of that stone blade is fixed, by its being of that semi-transparent opalescent calcedony which
• The floor of the cavern was covered with heaps of water-worn fragments of quartzose rock, containing copper pyrites, in some of which the cavities were covered by a deposit of...
• Upon the last southern table (23) are ranged further varieties of calcedony.
• Having sufficiently examined these beautiful varieties of calcedony, the visitor should pass at once to the northern range of tables.