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Pyrrhotite is an unusual iron sulfide mineral with a variable iron content: Fe(1-x)S (x = 0 to 0.2). The FeS endmember is known as troilite. Also called magnetic pyrite because the color is similar to pyrite and it is weakly magnetic, the magnetism increases as the iron content decreases. Image File history File links Mineraly. ...
This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ...
A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ...
General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ...
The term sulfide (sulphide in British) refers to several types of chemical compounds containing sulfur in its lowest oxidation number of -2. ...
In mineralogy, shape and size give rise to descriptive terms applied to the typical appearance, or habit of crystals. ...
Rose des Sables (Sand Rose), formed of gypsum crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ...
A regular hexagon A hexagon (also known as sexagon) is a polygon with six edges and six vertices. ...
In crystallography, the monoclinic crystal system is one of the 7 lattice point groups. ...
Cleavage, in mineralogy, is the tendency of crystalline materials to split along definite planes, creating smooth surfaces, of which there are several named types: Basal cleavage: cleavage parallel to the base of a crystal, or to the plane of the lateral axes. ...
A fracture is the separation of a body into two, or more, pieces under the action of stress. ...
Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ...
The refractive index of a material is the factor by which the phase velocity of electromagnetic radiation is slowed relative to vacuum. ...
Pleochroism is an optical phenomenon where due to double refraction of light by a colored gem or crystal, the light is divided into two paths which are polarized at a 90° angle to each other. ...
The term streak is used in several ways: Streaking, the act of running around nude in public places. ...
Relative density (also known as specific gravity) is a measure of the density of a material. ...
Fusibility is the ease with which a material will melt. ...
A substance is soluble in a fluid if it dissolves in that fluid. ...
The chemical substance hydrochloric acid is the aqueous (water-based) solution of hydrogen chloride (HCl) gas. ...
General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ...
The term sulfide (sulphide in British) refers to several types of chemical compounds containing sulfur in its lowest oxidation number of -2. ...
The mineral pyrite, or iron pyrite, is iron disulfide, FeS2. ...
In physics, magnetism is one of the phenomena by which materials exert an attractive or repulsive force on other materials. ...
Pyrrhotite is odd also because it has two crystal symmetries. When pyrrhotite is high in iron and the formula is closer to true FeS the structure is hexagonal. But, when it is low in iron, the structure is monoclinic. Both symmetries occur together is the same specimen.
The name is derived from Greek pyrrhos, flame-colored.
Pyrrhotite is a rather common trace constituent of igneous rocks. It occurs as segregation deposits from mafic igneous rocks associated with pentlandite, chalcopyrite and other sulfides. It also occurs in pegmatites and in contact metamorphic zones. The troilite endmember is found in meteorites. Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ...
In geology, mafic minerals and rocks are silicate minerals, magmas, and volcanic and intrusive igneous rocks that have relatively high concentrations of the heavier elements. ...
Pentlandite is a iron-nickel sulfide, (Fe,Ni)9S8. ...
Chalcopyrite is a copper iron sulfide mineral that crystallizes in the tetragonal system. ...
Pegmatite is a very coarse-grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic. ...
Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means change in form (from the Greek words meta, change, and morphe, form). The protolith is subjected to extreme heat (greater than 150 degrees Celsius) and pressure causing...
A meteorite is a small extraterrestrial body that impacts the Earths surface. ...
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