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collophane

[kol-uh-feyn]
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noun Mineralogy.
  1. a massive, cryptocrystalline variety of apatite that is the principal component of phosphate rock and fossil bone.
Also col·loph·a·nite [kuh-lof-uh-nahyt, kol-uh-fuh-] /kəˈlɒf əˌnaɪt, ˈkɒl ə fə-/.

Origin of collophane

1915–20; < German Kollophan, equivalent to Greek koll(a) glue + -o- -o- + -phan -phane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018