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Ammonites are called cephalopods because their heads and tentacles protruded out of the same opening
Chapter 2: The Mysterious Formation of Geodes in Igneous Rocks
Amethyst is also the birthstone for those born in the month of February
They are a unique formation of agate
PYR213 Pyrite in Matrix Angelwing Chalcedony Ammonites are called cephalopods becauseThis Pyrite cube in Marl Matrix is from Navajn, Spain. These are natural pyrite minerals and are famous all around the world for their incredible formation. Originally discovered in 1965, the mine has been continually worked to this day. The chemical formula for pyrite is FeS2. This features one cube measuring 2. 9 x 2. 9 x 3. 1cm in its original matrix, approximately 8cm long. You will receive the exact mineral specimen pictured. It is important to
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