Akademik

heliophyllite
\\ˌhēlēōˈfiˌlīt\ noun (-s)
Etymology: Swedish heliophyllit, from heli- (I) + -phyll + -it -ite
: a mineral approximately Pb6As2O7Cl4 consisting of oxychloride of lead and arsenic that is apparently dimorphous with ecdemite

Useful english dictionary. 2012.