from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A foliated or chalk-like variety of calcite.
from the GNU version of the Collaborative International Dictionary of English
- n. See under calcite.
from The Century Dictionary and Cyclopedia
- n. A subvariety of calcium carbonate or calcite, popularly known as foam, earth-foam, or foam-spar, occurring in small masses, solid, or tender and friable.
Sorry, no etymologies found.
Finely scaly varieties with a pearly lustre are known as argentine and aphrite (German _Schaumspath_); soft, earthy and dull white varieties as agaric mineral, rock-milk, rock-meal, &c. -- these form a transition to marls, chalk, &c.