matlockite
/ˈmatlɒkʌɪt/ /ˈmatləkʌɪt/Mineralogy
noun
A tetragonal fluoride and chloride of lead, PbFCl, usually occurring as transparent, colourless to yellow or yellowish brown tabular crystals.
- Originally misidentified as an oxychloride..
Origin
Mid 19th century (in an earlier sense). From Matlock, the name of a town in Derbyshire, England + -ite.