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used as an iron ore
it is mined for the production of sulphuric acid for the chemistry and fertilizer industry
with preserved insect inclusions suspended within the resin
or Iron Pyrite is a pale brass-yellow iron sulfate (FeS2) mineral
Golden Fern Fossil | Pennsylvania matrix used as an iron oreThis striking fossilized fern comes from the historic Pottsville Formation, dating back to the Pennsylvanian Period (~300 MYO) when vast coal swamps covered much of ancient Earth. The frond impressions display a rare golden coloration, caused by natural mineralization that highlights the delicate structure of the plant. This item is 10 x 6 and weighs 3 lbs 12 oz
