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2. Marcasite jewellery - Wikipedia

   en.wikipedia.org/wiki/Marcasite_jewellery

   Marcasite brooch made from pyrite and silver. Marcasite jewellery is jewellery made using cut and polished pieces of pyrite (fool's gold) as gemstone, and not, as the name suggests, from marcasite. [1] Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite ...

3. Pyrite - Wikipedia

   en.wikipedia.org/wiki/Pyrite

   The mineral pyrite (/ ˈ p aɪ r aɪ t / PY-ryte), [6] or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Fe S 2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral. [7] Pyrite cubic crystals on marl from Navajún, La Rioja, Spain (size: 95 by 78 millimetres [3.7 by 3.1 in], 512 grams [18.1 oz ...

4. Marcasite - Wikipedia

   en.wikipedia.org/wiki/Marcasite

   Marcasite reacts more readily than pyrite under conditions of high humidity. The product of this disintegration is iron(II) sulfate and sulfuric acid. The hydrous iron sulfate forms a white powder consisting of the mineral melanterite, FeSO 4 ·7H 2 O. [13] This disintegration of marcasite in mineral collections is known as "pyrite decay".

5. Bones from a Tudor warship reveal what life was like for the crew

   www.aol.com/news/bones-tudor-warship-reveal-life...

   But the 450 million-year-old fossil of Lomankus edgecombei, which resembles a shrimp, is preserved in fool’s gold, or iron pyrite. “Preservation in pyrite of this kind is extremely rare.

6. Jet (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Jet_(gemstone)

   Glass was used as a jet substitute during the peak of jet's popularity. [53] [54] When it was used in this way it was known as French jet or Vauxhall glass. [53] [54] Ebonite was also used as a jet substitute and initially looks very similar to jet, but it fades over time. [55] In some cases jet offcuts were mixed with glue and molded into ...

7. Lapis lazuli - Wikipedia

   en.wikipedia.org/wiki/Lapis_Lazuli

   Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.