also manufactured ring stones, seals, and other ornaments from it. The source of their obsidian was probably the island of Lipari, for exten­sive fields of beautiful obsidian are still known and worked there. It also occurs in the neighboring islands. Its use at the present time is chiefly for making mourning jewelry it being preferred by some to jet. Obviously, it can be closely imitated in glass; and though the cost of cut obsidian is small, glass is still cheaper. The schillerizing, or chatoyant obsidian, is more highly prized than the plain, and cut en cabochon it makes a very pretty ring stone. Obsidian is sometimes called Iceland agate, perhaps because obtained in Iceland, although by some it is thought that the name is a corrup­tion of island agate, from the occurrence of the stone in the islands of the Mediterranean.
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