Gypsum
description: <p style="text-align: justify;">LOCALITY: Pernatty Lagoon, near Mount Gunson, South Australia (state), Australia <br /><br />8" across <br /><br />This specimen of crystalline gypsum owes its color to the "contamination" of the calcium sulfate crystal lattice by ferrous cations.  These were released into the lagoon by mining activities at the Mount Gunson copper mine.  Since the color of this piece resulted from human intervention, most collectors will not include green gypsum in a mineral collection.  </p> <p style="text-align: justify;"> </p> <p style="text-align: justify;">Green gypsum from Pernatty Lagoon was much more common on the mineral specimen market during the 1980's and 1990's.  With each "mining season" of gypsum at Pernatty Lagoon, the crystals varied in color, luster, density and size.  During "mining", specimens were simply "plucked" from the bed of the salt lake.</p> <p style="text-align: justify;"> </p> <p style="text-align: justify;">This piece was bought from a Melbourne collector in October 2015.  </p>

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