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Toad-stone

TOAD-STONE, n. [toad and stone.] In mineralogy, a sort of trap rock, of a brownish gray color. The toad-stone of Derbyshire is generally a dark brown basaltic amygdaloid, composed of basalt and green earth, an...

Webster Dictionary
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Meaning

TOAD-STONE, n. [toad and stone.] In mineralogy, a sort of trap rock, of a brownish gray color. The toad-stone of Derbyshire is generally a dark brown basaltic amygdaloid, composed of basalt and green earth, and containing oblong cavities filled with calcarious spar.

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