21mm PYRITE AMMONITE Fossil Toarcian Jurassic Aveyron France fossilien shell lot

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21mm PYRITE AMMONITE Fossil Toarcian Jurassic Aveyron France fossilien shell lot:
$16.50

ORIGIN - Aveyron-France

AGE - 190 million years MEZOSOIC -Jurassic

Lower Lias

I always sell what you see in the picture.

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Pyrite ammonite must be kept dry and minimum humidity because of oxidation.

The mineral pyrite, or iron pyrite, is iron disulfide, FeS2. Pyrite is commonly called to as \'\'Fool\'s Gold\'\'. Pyrite is by far the most common and the most often mistaken for gold. Difference is that Pyrite is much harder and more brittle than gold. Pyrite contains a high percentage of iron.One of the most important chemical processes in organic-rich marine sediments is decomposition of organic matter in bacterial sulphate reduction. Bacterial sulphate reduction produces bisulphide. The reaction of reduced sulphur with reactive dissolved iron and iron minerals, if available, results in the formation of iron sulphides. The most common iron sulphide in pyrite.The amount of pyrite formation in marine sediments is largely determined by the availability of sulphate, reactive iron and reactive organic matter during the formation of the sediments.Pyrite - during the fossilization process the formation of the bisulfite iron - FeS2. Pyrite takes place in oxygen-free Environments, enriched with hydrogen sulphide (H2S). . Thus preserved fossils are characterized by striking yellow color and contrast well with the surrounding upper.ammonite is necessary to preserve the widest drought, otherwise subject to oxidation and darkens!

with larger orders I will send gift !!

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On Jul-17-16 at 11:14:39 PDT, seller added the following information: