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  2. Pyrite - Wikipedia

    en.wikipedia.org/wiki/Pyrite

    Until the vacuum tube matured, the crystal detector was the most sensitive and dependable detector available—with considerable variation between mineral types and even individual samples within a particular type of mineral. Pyrite detectors occupied a midway point between galena detectors and the more mechanically complicated perikon mineral ...

  3. Iron(II) sulfate - Wikipedia

    en.wikipedia.org/wiki/Iron(II)_sulfate

    Iron(II) sulfate outside a titanium dioxide factory in Kaanaa, Pori, Finland. Upon dissolving in water, ferrous sulfates form the metal aquo complex [Fe(H 2 O) 6] 2+, which is an almost colorless, paramagnetic ion. On heating, iron(II) sulfate first loses its water of crystallization and the original green crystals are converted into a white ...

  4. Marcasite - Wikipedia

    en.wikipedia.org/wiki/Marcasite

    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 ". When a specimen goes through pyrite decay, the marcasite reacts with moisture and oxygen in the air, the sulfur oxidizing and combining with water to ...

  5. Fenton's reagent - Wikipedia

    en.wikipedia.org/wiki/Fenton's_reagent

    Fenton's reagent is a solution of hydrogen peroxide (H 2 O 2) and an iron catalyst (typically iron(II) sulfate, FeSO 4). [1] It is used to oxidize contaminants or waste water as part of an advanced oxidation process. Fenton's reagent can be used to destroy organic compounds such as trichloroethylene and tetrachloroethylene (perchloroethylene).

  6. LOHAFEX - Wikipedia

    en.wikipedia.org/wiki/Lohafex

    A cyclonic eddy centered on 48 deg S, 16 deg E was selected for fertilization. The experiment began on India's Republic Day (26 January 2009). 10 tonnes (9.8 long tons; 11 short tons) of ferrous sulfate dissolved in seawater was spread over an area of 300 square kilometres (120 sq mi), and the patch created was monitored for 38 days to investigate the effects of iron addition on marine ...

  7. Green rust - Wikipedia

    en.wikipedia.org/wiki/Green_rust

    Green rust is a generic name for various green crystalline chemical compounds containing iron(II) and iron(III) cations, the hydroxide (OH −) anion, and another anion such as carbonate (CO 2− 3), chloride (Cl −), or sulfate (SO 2− 4), in a layered double hydroxide (LDH) structure. The most studied varieties are the following: [1]

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