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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. Pyrrhotite - Wikipedia

    en.wikipedia.org/wiki/Pyrrhotite

    Pyrrhotite. Brassy, tabular crystals of pyrrhotite, with sphalerite and quartz, from Nikolaevskiy Mine, Primorskiy Kray, Russia. Specimen size: 5.3 × 4.1 × 3.8 cm. 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 ...

  4. Euhedral and anhedral - Wikipedia

    en.wikipedia.org/wiki/Euhedral_and_anhedral

    Euhedral pyrite crystals A subhedral sample showing sharp to anhedral pyrargyrite crystals. Euhedral and anhedral are terms used to describe opposite properties in the formation of crystals . Euhedral (also known as idiomorphic or automorphic ) crystals are those that are well-formed, with sharp, easily recognised faces .

  5. Pyrite group - Wikipedia

    en.wikipedia.org/wiki/Pyrite_group

    Pyrite group. The pyrite group of minerals is a set of cubic crystal system minerals with diploidal structure. Each metallic element is bonded to six "dumbbell" pairs of non-metallic elements and each "dumbbell" pair is bonded to six metal atoms. [1] [2]

  6. Cubic crystal system - Wikipedia

    en.wikipedia.org/wiki/Cubic_crystal_system

    The crystal structure of pyrite is primitive cubic, and this is reflected in the cubic symmetry of its natural crystal facets. A network model of a primitive cubic system The primitive and cubic close-packed (also known as face-centered cubic) unit cells. In crystallography, the cubic (or isometric) crystal system is a crystal system where the ...

  7. Dodecahedron - Wikipedia

    en.wikipedia.org/wiki/Dodecahedron

    The name crystal pyrite comes from one of the two common crystal habits shown by pyrite (the other one being the cube). In pyritohedral pyrite, the faces have a Miller index of (210), which means that the dihedral angle is 2·arctan(2) ≈ 126.87° and each pentagonal face has one angle of approximately 121.6° in between two angles of ...

  8. Marcasite - Wikipedia

    en.wikipedia.org/wiki/Marcasite

    The mineral marcasite, sometimes called " white iron pyrite ", is iron sulfide (FeS 2) with orthorhombic crystal structure. It is physically and crystallographically distinct from pyrite, which is iron sulfide with cubic crystal structure. Both structures contain the disulfide S 22− ion, having a short bonding distance between the sulfur atoms.

  9. Goethite - Wikipedia

    en.wikipedia.org/wiki/Goethite

    Composition. Goethite is an iron oxyhydroxide containing ferric iron. It is the main component of rust and bog iron ore. Goethite's hardness ranges from 5.0 to 5.5 on the Mohs Scale, and its specific gravity varies from 3.3 to 4.3. The mineral forms prismatic needle-like crystals ("needle ironstone" [3]) but is more typically massive.

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