Hemimorphite pseudomorph after Calcite crystals, Greenockite
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Hemimorphite pseudomorph after calcite crystals, colored by greenockite, 7.8 cm, Joplin, Missouri. Ex George Vaux Jr., Richard Hauck collections. Jeff Scovil photo.
Joplin Field, USA, Missouri heart of the Tri-State lead-zinc district; famed for layered galena-sphalerite specimens with calcite, dolomite, and marcasite.
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