Forms in low-temperature
hydrothermal veins, often with zinc and lead sulfides. Like pyrite, it is
used for the extraction of sulfuric acid. Because of its bright luster it
used to be cut for trinkets. From Alabama.
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M906 -
Marcasite Nodules, Alabama
 Marcasite
is a Iron Sulfide. Hardness 6 to 6-1/5. Marcasite appers in a number of
crystal formations, the concretionary or nodular form is probably the
most common.
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