Fluorite, Goethite
Red Grooves Lead Mine, Newbiggin, County Durham, England, UK
Size: 35x25x15mm
** THUMBNAIL **
MORPHOLOGY: Cubic
COLOUR: Colourless
MAX CRYSTAL DIMENSION: 3.5 mm
The gemmy colourless Fluorites of this specimen have grown on an oxidized Siderite matrix, which has retained the crystal shape of the iron carbonate, but is a dull black.
(image processed using CombineZP stacking software)