from The Century Dictionary.
- noun A mineral occurring in massive forms of a dull-white color, consisting of the silicate, carbonate, and sulphate of calcium with water. The name has reference to its unusual composition.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A hexagonal-dipyramidal
mineralcontaining calcium, carbon, hydrogen, oxygen, silicon, and sulfur.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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