This specimen from Second Chance Mine beautifully displays a pattern referred to by collectors as 'boxwork.' Here, the boxwork structure appears as glittery white planes of quartz crystals extending between groupings of vibrant purple fluorite crystals. These planes of while quartz formed after calcite as a type of pseudomorph known as an epimorph. In an epimorph, one mineral forms as a coating along the surfaces of another, and the original mineral later dissolves, leaving a cast of its shape.
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