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The top documents tagged [trueclearlight slide]
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trueclearlight slide
Pyrite by-nc-sa: bonsaikiptb. When pyrite is struck against metal or a hard surface, it creates a spark. by: westy559 by-sa: matthewvenn.
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Sulfur …is the brimstone of myth and legend, as in this depiction of “Hell” from the 12 th century. public domain.
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