pentahydroborite
/ˌpɛntəhʌɪdrə(ʊ)ˈbɔːrʌɪt/Mineralogy
noun
A mineral consisting of a pentahydrated calcium borate, CaB2O4·5H2O, occurring as small, colourless crystals and belonging to the triclinic crystal system.
Origin
1960s; earliest use found in American Mineralogist. From penta- + hydro- + bor- + -ite, after Russian pentagidroborit.