collophane

collophane

[kol-uh-feyn]
noun Mineralogy.
a massive, cryptocrystalline variety of apatite that is the principal component of phosphate rock and fossil bone.
Also, collophanite [kuh-lof-uh-nahyt, kol-uh-fuh-] .


Origin:
1915–20; < German Kollophan, equivalent to Greek koll(a) glue + -o- -o- + -phan -phane

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