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2. Pyrite - Wikipedia

   en.wikipedia.org/wiki/Pyrite

   Cubic, faces may be striated, but also frequently octahedral and pyritohedral. Often inter-grown, massive, radiated, granular, globular, and stalactitic. The mineral pyrite (/ ˈpaɪraɪt / 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).

3. Chalcopyrite - Wikipedia

   en.wikipedia.org/wiki/Chalcopyrite

   Chalcopyrite (/ ˌkælkəˈpaɪˌraɪt, - koʊ -/ [7][8] KAL-kə-PY-ryte, -⁠koh-) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS 2 and crystallizes in the tetragonal system. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale.

4. Pentlandite - Wikipedia

   en.wikipedia.org/wiki/Pentlandite

   Pentlandite in pyrrhotite, ore specimen from the Sudbury Basin (field of view 3.4 cm). Pentlandite is an iron–nickel sulfide with the chemical formula (Fe,Ni) 9 S 8.Pentlandite has a narrow variation range in nickel to iron ratios (Ni:Fe), but it is usually described as 1:1.

5. Davis, Massachusetts - Wikipedia

   en.wikipedia.org/wiki/Davis,_Massachusetts

   Davis, Massachusetts, is the abandoned location of the Davis Pyrite Mine, located in the town of Rowe, Massachusetts. Once the largest iron pyrite mine in Massachusetts, Davis grew to be a decent sized mining village at the beginnings of the Second Industrial Revolution (1870–1915). But in 1911, a non-fatal collapse of the mine due to "poor ...

6. Pyrrhotite - Wikipedia

   en.wikipedia.org/wiki/Pyrrhotite

   Pyrrhotite (pyrrhos in Greek meaning "flame-coloured") is an iron sulfide mineral with the formula Fe (1-x) S (x = 0 to 0.125). It is a nonstoichiometric variant of FeS, the mineral known as troilite. Pyrrhotite is also called magnetic pyrite, because the color is similar to pyrite and it is weakly magnetic.

7. 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".