ˈhilˌgärˌdīt, -_gər- noun
( -s )
Etymology: Eugene W. Hilgard died 1916 American geologist + English -ite
: a mineral Ca 8 (B 6 O 11 ) 3 Cl 4 .4H 2 O consisting of hydrous chloride and borate of calcium occurring in colorless monoclinic domatic crystals