{| border=1 cellspacing=0 align=right cellpadding=0 width=250 style="margin-left:1em" |----- align=center bgcolor="#9966FF" !colspan=2 align=center|Pyrrhotite |----- align=center !colspan=2|Image needed |----- align=center bgcolor="#9966FF" !colspan=2|General |----- |Category||Mineral |----- |Chemical formula||iron sulfide:Fe1-xS (x = 0 to 0.2) |----- align="center" bgcolor="#9966FF" !colspan=2|Identification |----- | Color || Bronze |----- | Crystal habit || Tabular or prismatic in hexagonal prisms; massive to granular |----- | Crystal structure || hexagonal, 6/m2/m2/m and monoclinic, 2/m |----- | Cleavage|| Absent |----- | Fracture|| Uneven |----- | Mohs Scale hardness || 3.5 - 4.5 |----- | Luster||Metallic |----- | Refractive index||Opaque |----- | Pleochroism|| N/A |----- | Streak|| Dark gray - black |----- | Specific gravity|| 4.6 |----- | Fusibility|| 3 |----- | Solubility|| Soluble in hydrochloric acid |----- | Other Characteristics||Weakly magnetic, strongly magnetic on heating |----- align="center" bgcolor="#9966FF" !colspan=2|Major varieties |----- !colspan=2|None |} 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. 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 occurrs as segregation deposits from mafic igneous rocks associated with pentlandite, chalcopyrite and other sulfides. It also occurrs in pegmatites and in contact metamorphic rock zones. The troilite endmember is found in meteorites. == References and external links == *Dana's Manual of Mineralogy ISBN 0471032883 * [http://mineral.galleries.com/minerals/sulfides/pyrrhoti/pyrrhoti.htm Mineral Galleries: Pyrrhotite] *[http://webmineral.com/data/Pyrrhotite.shtml Webmineral.com] *[http://www.mindat.org/min-3328.html Mindat.org] Minerals Sulfide minerals
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Words begining with Pyrrhotite:
Pyrrhotite
Pyrrhotite
{| border=1 cellspacing=0 align=right cellpadding=0 width=250 style="margin-left:1em" |----- align=center bgcolor="#9966FF" !colspan=2 align=center|Pyrrhotite |----- align=center !colspan=2|Image needed |----- align=center bgcolor="#9966FF" !colspan=2|General |----- |Category||Mineral |----- |Chemical formula||iron sulfide:Fe1-xS (x = 0 to 0.2) |----- align="center" bgcolor="#9966FF" !colspan=2|Identification |----- | Color || Bronze |----- | Crystal habit || Tabular or prismatic in hexagonal prisms; massive to granular |----- | Crystal structure || hexagonal, 6/m2/m2/m and monoclinic, 2/m |----- | Cleavage|| Absent |----- | Fracture|| Uneven |----- | Mohs Scale hardness || 3.5 - 4.5 |----- | Luster||Metallic |----- | Refractive index||Opaque |----- | Pleochroism|| N/A |----- | Streak|| Dark gray - black |----- | Specific gravity|| 4.6 |----- | Fusibility|| 3 |----- | Solubility|| Soluble in hydrochloric acid |----- | Other Characteristics||Weakly magnetic, strongly magnetic on heating |----- align="center" bgcolor="#9966FF" !colspan=2|Major varieties |----- !colspan=2|None |} 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. 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 occurrs as segregation deposits from mafic igneous rocks associated with pentlandite, chalcopyrite and other sulfides. It also occurrs in pegmatites and in contact metamorphic rock zones. The troilite endmember is found in meteorites. == References and external links == *Dana's Manual of Mineralogy ISBN 0471032883 * [http://mineral.galleries.com/minerals/sulfides/pyrrhoti/pyrrhoti.htm Mineral Galleries: Pyrrhotite] *[http://webmineral.com/data/Pyrrhotite.shtml Webmineral.com] *[http://www.mindat.org/min-3328.html Mindat.org] Minerals Sulfide minerals
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Pyrrhotite
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