ˌhīəlōˈtēˌkīt noun
( -s )
Etymology: Swedish hyalotekit, from hyal- + Greek tēkein to melt + Swedish -it -ite; from the fact that it fuses to a clear glass — more at thaw
: a mineral approximately (Pb,Ca,Ba) 4 BSi 6 O 17 (OH,F) consisting of a borosilicate and fluoride of lead, barium, and calcium found in crystalline masses