Emily Dickinson Lexicon

AM'MITE, or HAM'MITE, n. [Gr. αμμος, sand.]

A sand-stone or free-stone, of a pale brown color, very heavy, of a lax texture, composed of small round granules, cemented by an earthy sparry matter. The grit or granules are small stalagmites, composed of crusts or coats including one another. It is the roe-stone or oölite of recent authors. – Da Costa. Plin. 37. 10.