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Sulfide mineral, pyrite group: Formula (repeating unit) MnS 2: IMA symbol: Hr [1] Strunz classification: 2.EB.05a: Crystal system: Cubic: Crystal class: Diploidal (m 3) H–M symbol: (2/m 3) Space group: Pa 3: Unit cell: a = 6.107 Å; Z = 4: Identification; Formula mass: 119.07 g/mol: Color: Reddish brown or brownish black: Crystal habit ...
The mineral pyrite (/ ˈ p aɪ r aɪ t / 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). Pyrite is the most abundant sulfide mineral .
Sperrylite on chalcopyrite with magnetite, Oktyabersky Mine, Norilsk.Field of view 2.2 cm. Sperrylite is a platinum arsenide mineral with the chemical formula PtAs 2 and is an opaque metallic tin white mineral which crystallizes in the isometric system with the pyrite group structure.
The group is named for its most common member, pyrite (fool's gold), which is sometimes explicitly distinguished from the group's other members as iron pyrite. Pyrrhotite (magnetic pyrite) is magnetic, and is composed of iron and sulfur , but it has a different structure and is not in the pyrite group.
Erlichmanite is the naturally occurring mineral form of osmium sulfide (OsS 2).It is grey with a metallic luster, hardness around 5, and specific gravity about 9. [2] It is found in noble metal placer deposits. [3]
The vivianite is intimately associated with pyrite and occurs as very thin tabular crystals, up to 10 cm in length. [10] Kosovo. Trepča Mines, Stari Trg. Thick prismatic crystals up to 10 cm long and 2 cm thick, relatively stable. Deep green in color and transparent, commonly resting on pyrrhotite or pyrite, and in some cases on quartz or ...
The type of bonds found in the Pyrite group is covalent, but not in penroseite. For example, pyrite FeS 2, which has the same structure as penroseite and is thought to have similar coordination, has one Fe atom surrounded by six atoms of S, an octahedral coordination. On the other hand, the S atom is surrounded by 4 Fe atoms in a tetrahedral ...
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 produce sulfuric acid that attacks other sulfide minerals and mineral labels.