Mineral: Quartz with Siderite
Locality: Potosí Mine, Santo Domingo (Francisco Portillo), Santa Eulalia District, Municipio Aquiles Serdán, Chihuahua, Mexico
Dimensions: 11.5 x 6.8 cm

Description: Double terminated quartz embedded along with a number of other quartz crystals in what might be descloizite.

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