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Matlockite

Matlockite is a rare lead halide mineral, named after the town of Matlock in Derbyshire, England, where it was first discovered in a nearby mine. Matlockite gives its name to the matlockite group which consists of rare minerals of a similar... Wikipedia
Colour: Colourless to yellow and greenish
Crystal class: Ditetragonal dipyramidal (4/mmm); H-M symbol: (4/m 2/m 2/m)
Crystal habit: Flattened, tabular crystals occurring as aggregates, rosettelike, radiating, hemispherical; also massive
Crystal system: Tetragonal
Formula (repeating unit): PbFCl
Optical properties: Uniaxial (−)