Pyrite and Galena
long floater pseudo-cubic pyrite crystal with brass luster and striated faces, partially covered with lots of tiny lustrous galena crystals.
Miniature
Mineral specimens with larger dimension between 30 and 60 milimeters (mm).
Selenite gypsum over calcite
Clear gypsum variety selenite crystal on yellowish calcite matrix, from famous Naica mine
Opal in rhyolite matrix
Opal with play of colors, embedded in its rhyolite cantera matrix
