ardealite

noun

ar·​de·​al·​ite

ˌärdēˈäˌlīt

plural -s

: a mineral Ca₂H(PO₄)(SO₄)·4H₂O consisting of a hydrous acid calcium phosphate-sulfate

Word History

Etymology

German ardealit, from Ardeal Transylvania, region of Romania + German -it -ite

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