Synonyms:
obsidian
Meaning: acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces
Usage examples
Sea-shells from the Gulf, pearls from the Atlantic, and obsidian from Mexico, have also been found side by side in their mounds.
A fragment of flint or obsidian may be made fast to a handle, to be used as a carpenter cuts paper With a chisel; namely, by holding it dagger-fashion, and drawing it over the skin or flesh which he wishes to cut.