One of the mysteries of the English language finally explained.
A mineral consisting of a pentahydrated calcium borate, CaB₂O₄·5H₂O, occurring as small, colourless crystals and belonging to the triclinic crystal system.
1960s; earliest use found in American Mineralogist. From penta- + hydro- + bor- + -ite, after Russian pentagidroborit.
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