• Mineralien
  Minerals are naturally occurring solids with a defined chemical composition and a certain physical crystal structure. For historical reasons also liquid mercury is recognized of that internationally Mineralogical Association (IMA) as mineral. One calls amorphous substances, which fulfill the remaining criteria, Mineraloide. The majority to that today admitted approx. 4,000 minerals are inorganic, but also some organic substances like the Nierensteinbildner Whewellit and Wedellit are appreciative as minerals, because they also naturally form.
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