pachnolite
noun
pach·no·lite
ˈpaknəˌlīt
plural -s
: a mineral NaCaAlF6.H2O consisting of a hydrous fluoride of sodium, calcium, and aluminum occurring in colorless to white monoclinic crystals (hardness 3, specific gravity 3)
Word History
Etymology
German pachnolit, from Greek pachnē hoarfrost + German -lit -lite; akin to Greek pēgnynai to fasten together