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2. 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 ...

3. Iron(III) sulfate - Wikipedia

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

   Iron(III) sulfate (or ferric sulfate), is a family of inorganic compounds with the formula Fe 2 (SO 4) 3 (H 2 O) n. A variety of hydrates are known, including the most commonly encountered form of "ferric sulfate".

4. 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).

5. Pyrite - Wikipedia

   en.wikipedia.org/wiki/Pyrite

   Concrete exposed to sulfate ions, or sulfuric acid, degrades by sulfate attack: the formation of expansive mineral phases, such as ettringite (small needle crystals exerting a huge crystallization pressure inside the concrete pores) and gypsum creates inner tensile forces in the concrete matrix which destroy the hardened cement paste, form ...

6. Pyrrhotite - Wikipedia

   en.wikipedia.org/wiki/Pyrrhotite

   Pyrrhotite generally displays massive to granular crystal habit, and may show tabular/prismatic or hexagonal crystals which are sometimes iridescent. [ 14 ] Diagnostic characteristics in hand sample include: brassy/bronze color with a grey/black streak, tabular or hexagonal crystals which show iridescence, subconchoidal fracture , metallic ...

7. Ammonium iron(II) sulfate - Wikipedia

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

   Ammonium iron(II) sulfate, or Mohr's salt, is the inorganic compound with the formula (NH 4) 2 SO 4 ·Fe(SO 4)·6H 2 O. Containing two different cations, Fe 2+ and NH + 4, it is classified as a double salt of ferrous sulfate and ammonium sulfate. It is a common laboratory reagent because it is readily crystallized, and crystals resist oxidation ...

8. Ammonium iron(III) sulfate - Wikipedia

   en.wikipedia.org/wiki/Ammonium_iron(III)_sulfate

   Ammonium iron(III) sulfate, NH 4 Fe(SO 4) 2 ·12 H 2 O, or NH 4 [Fe(H 2 O) 6](SO 4) 2 ·6 H 2 O, also known as ferric ammonium sulfate (FAS) or iron alum, is a double salt in the class of alums, which consists of compounds with the general formula AB(SO 4) 2 · 12 H 2 O. [2] It has the appearance of weakly violet, octahedrical crystals.

9. Chemical garden - Wikipedia

   en.wikipedia.org/wiki/Chemical_garden

   If one uses a metal salt that produces a very dense fluid inside the membrane, the growth is downward. For example, a green solution of trivalent chromium sulfate or chloride refuses to crystallize without slowly changing into the violet form [clarification needed], even if boiled until it concentrates into a tarry mass. That tar, if suspended ...