Smoky quartz and siderite - Col des cristaux, Mont-Blanc...
Smoky quartz point partly covered with siderite. 3.5 x 3.4 x...
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Smoky quartz point partly covered with siderite. 3.5 x 3.4 x...
This piece is made up of very shiny red sphalerite,...
Iridescent sphalerite measuring 1 cm on bright siderite and...
Petals of bright siderite, of typical coarse/green color of...
A plate of siderite rhombohedrons with an excellent brilliance...