Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A colorless to greenish yellow or black mineral, Al3(PO4)2(OH)3·5H2O, having finely acicular, radiating crystals and sometimes mined for the extraction of phosphorous.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hydrated aluminium phosphate, Al3(PO4)2(OH,F)3·5H2O, sometimed mined as a source of phosphorus.

from the GNU version of the Collaborative International Dictionary of English

  • n. A hydrous phosphate of alumina, occurring usually in hemispherical radiated forms varying in color from white to yellow, green, or black.

from The Century Dictionary and Cyclopedia

  • n. A hydrous phosphate of aluminium, commonly found in radiated hemispherical or globular crystalline concretions from a very small size to 1 inch in diameter, and of a white to yellow-green or brown color. See cut under radiate.

Etymologies

After W. Wavell (died 1829), British physician.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Wavell +‎ -ite, after W. Wavell, British physician. (Wiktionary)

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