enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. 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".

  3. Frohbergite - Wikipedia

    en.wikipedia.org/wiki/Frohbergite

    Based on its chemical formula and crystal structure, the mineral was initially assigned to the marcasite group, where it forms a continuous mineral line with mattagamite. Moreover, frohbergite and mattagamite respectively represent the extreme members of a series of solid natural solutions FeTe 2 → Co Te 2 .

  4. Marcasite jewellery - Wikipedia

    en.wikipedia.org/wiki/Marcasite_jewellery

    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 is more stable and less brittle than marcasite.

  5. List of mineral symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_mineral_symbols

    New minerals approved by the International Mineralogical Association (IMA-CNMNC) are allocated unique symbols consistent with the main listing. New symbols are announced in the newsletters of the IMA-CNMNC. An updated "mineral symbol picker" list [7] is also available for checking on the availability of symbols prior to submission for approval.

  6. Geology of Vietnam - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Vietnam

    Vietnam's mineral resources, apart from offshore oil and gas, include phosphate, coal, bauxite, base and precious metals, and a variety of industrial minerals. More than 5,000 mineral occurrences have been identified. Five broadly-defined metallogenic epochs have been recognised and, in general, the younger the setting the more abundant the ...

  7. Ministry of Natural Resources and Environment (Vietnam)

    en.wikipedia.org/wiki/Ministry_of_Natural...

    The Ministry of Natural Resources and Environment (MONRE, Vietnamese: Bộ Tài nguyên và Môi trường) is a government ministry in Vietnam responsible for: land, water resources; mineral resources, geology; environment; hydrometeorology; climate change; surveying and mapping; management of the islands and the sea.

  8. April 1950 - Wikipedia

    en.wikipedia.org/wiki/April_1950

    Researchers at the Massachusetts Institute of Technology showed the first photograph demonstrating the appearance of an atom, using x-rays to simulate a pattern of iron and sulphur atoms, within the mineral marcasite, magnified more than 10,000,000 times. [26] Born: Grzegorz Lato, Polish soccer football star, in Malbork

  9. Rozenite - Wikipedia

    en.wikipedia.org/wiki/Rozenite

    Rozenite is a hydrous iron sulfate mineral, Fe 2+ SO 4 ·4(H 2 O). It occurs as a secondary mineral, formed under low humidity at less than 21 °C (70 °F) as an alteration of copper-free melanterite, which is a post mine alteration product of pyrite or marcasite. It also occurs in lacustrine sediments and coal seams.