Selenite crystals on alabaster from Spain - cabinet size

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Selenite crystals on alabaster from Spain - cabinet size
€22.50

Selenite crystals on alabaster from the famous Alabaster quarries, Fuentes de Ebro, Zaragoza, Aragón, Spain.
I'm not sure what the black spots are (bitumen?)
6.5 cm x 4.5 cm x 4 cm
84 gram