Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Marcasite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
FeS2
System:
Orthorhombic
Colour:
Pale brass-yellow, ...
Lustre:
Metallic
Hardness:
6 - 6½
Member of:
Name:
Named in 1845 by Wilhelm Karl von Haidinger after an Arabic or Moorish name applied to pyrite and similar metallic bronze colored minerals. Johnathan Hill used the same name in 1771, but his usage was indiscriminate and was a term for any massive "pyrites" or mundic.
Isostructural with:
Marcasite Group.

Crystals common, metallic pale brass-yellow colored, tabular or pyramidal, often with curved faces; it may also be stalactic, globular, or reniform with a radiating internal structure. Frequently found replacing organic matter, forming fossils, in sedimentary beds, particularly coal beds.
May be intergrown or replaced by pyrite.

Visit gemdat.org for gemological information about Marcasite.

Classification of Marcasite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
2.EB.10a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
Dana 7th ed.:
2.12.2.1
2.12.2.1

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.9.4

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
9 : Sulphides etc. of Fe
mindat.org URL:
http://www.mindat.org/min-2571.html
Please feel free to link to this page.

Occurrences of Marcasite

Geological Setting:
Most frequently found in sedimentary rocks and coal beds, as a replacement mineral forming fossils, it is a mineral of low-temperature, near-surface, environments, forming from acid solutions. Pyrite, the more stable form of FeS^2, forms under conditions of higher temperatures and lower acidity or alkaline environments.

Physical Properties of Marcasite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Pale brass-yellow, tin-white on fresh exposures.
Streak:
Dark-grey to black.
Hardness (Mohs):
6 - 6½
Hardness (Vickers):
VHN200=915 - 1099 kg/mm2
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Distinct/Good
Distinct on {101}. {110} in traces.
Fracture:
Irregular/Uneven
Density:
4.887 g/cm3 (Measured)    4.875 g/cm3 (Calculated)

Crystallography of Marcasite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnnm
Cell Parameters:
a = 4.436Å, b = 5.414Å, c = 3.381Å
Ratio:
a:b:c = 0.819 : 1 : 0.624
Unit Cell Volume:
V 81.20 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals usually tabular on {010}, also pyramidal, faces often curved; also stalactic, globular, or reniform with radiating internal structure.
Twinning:
Common on {101}, forming "swallowtail" contact twins; this may be repeated to form stellate fivelings. Less common on {011}.

Crystallographic forms of Marcasite

Crystal Atlas:
Image Loading
Click on an icon to view
Marcasite no.80 - Goldschmidt (1913-1926)
Marcasite no.90 - Goldschmidt (1913-1926)
Marcasite no.141 - Goldschmidt (1913-1926)
Marcasite no.148 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

Toggle
Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.43(70)
2.71(30)
2.69(100)
2.41(40)
2.31(30)
1.91(30)
1.75(50)
1.59(20)

Optical Data of Marcasite

Type:
Anisotropic
Anisotropism:
Strong yellow to light green to dark green
Pleochroism:
Strong
Comments:
Creamy white, light yellowish white, white with rose brown tint.

Chemical Properties of Marcasite

Formula:
FeS2
Essential elements:
All elements listed in formula:
Common Impurities:
Cu,As

Relationship of Marcasite to other Species

Member of:
Other Members of Group:
2.EB.05aAurostibiteAuSb2
2.EB.05bBambollaiteCu(Se,Te)2
2.EB.05aCattieriteCoS2
2.EB.05aErlichmaniteOsS2
2.EB.05aFukuchiliteCu3FeS8
2.EB.05aGeversitePtSb2
2.EB.05aHaueriteMnS2
2.EB.05aInsizwaitePt(Bi,Sb)2
2.EB.05aKrut'aiteCuSe2
2.EB.05aLauriteRuS2
2.EB.05aPenroseite(Ni,Co,Cu)Se2
2.EB.05aPyriteFeS2
2.EB.05aSperrylitePtAs2
2.EB.05aTrogtaliteCoSe2
2.EB.05aVaesiteNiS2
2.EB.05aVillamaninite(Cu,Ni,Co,Fe)S2
2.EB.05aDzharkeniteFeSe2
2.EB.05aGaotaiiteIr3Te8
2.EB.10bAlloclasiteCo1-xFexAsS
2.EB.10dCostibiteCoSbS
2.EB.10aFerroseliteFeSe2
2.EB.10aFrohbergiteFeTe2
2.EB.10cGlaucodot(Co0.50Fe0.50)AsS
2.EB.10aKulleruditeNiSe2
2.EB.10aMattagamiteCoTe2
2.EB.10eParacostibiteCoSbS
2.EB.10ePararammelsbergiteNiAs2
2.EB.10fOeniteCoSbAs
2.EB.15aAnduoite(Ru,Os)As2
2.EB.15aClinosaffloriteCoAs2
2.EB.15aLöllingiteFeAs2
2.EB.15aNisbiteNiSb2
2.EB.15aOmeiite(Os,Ru)As2
2.EB.15cPaxiteCuAs2
2.EB.15aRammelsbergiteNiAs2
2.EB.15aSafflorite(Co,Ni,Fe)As2
2.EB.15bSeinäjokite(Fe,Ni)(Sb,As)2
2.EB.20ArsenopyriteFeAsS
2.EB.20GudmunditeFeSbS
2.EB.20Osarsite(Os,Ru)AsS
2.EB.20Ruarsite(Ru,Os)AsS
2.EB.25CobaltiteCoAsS
2.EB.25GersdorffiteNiAsS
2.EB.25Hollingworthite(Rh,Pt,Pd)AsS
2.EB.25Irarsite(Ir,Ru,Rh,Pt)AsS
2.EB.25JolliffeiteNiAsSe
2.EB.25KrutoviteNiAs2
2.EB.25MaslovitePtBiTe
2.EB.25MicheneritePdBiTe
2.EB.25PadmaitePdBiSe
2.EB.25PlatarsitePtAsS
2.EB.25TestibiopalladitePdTe(Sb,Te)
2.EB.25TolovkiteIrSbS
2.EB.25UllmanniteNiSbS
2.EB.25Willyamite(Co,Ni)SbS
2.EB.25ChangchengiteIrBiS
2.EB.25MayingiteIrBiTe
2.EB.25Hollingsworthite
2.EB.25KalungaitePdAsSe
2.EB.25MilotaitePdSbSe
2.EB.30UrvantsevitePd(Bi,Pb)2
2.EB.35RheniiteReS2
3.9.1PyrrhotiteFe1-xS (x = 0 to 0.17)
3.9.3PyriteFeS2
3.9.5GreigiteFe2+Fe23+S4
3.9.6Mackinawite(Fe,Ni)9S8
3.9.7Smythite(Fe,Ni)3+xS4 (x=0-0.3)
3.9.8Achavalite(Fe,Cu)Se
3.9.9FerroseliteFeSe2
3.9.10FrohbergiteFeTe2
3.9.11LöllingiteFeAs2
3.9.12ArsenopyriteFeAsS
3.9.13GudmunditeFeSbS

Other Names for Marcasite

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Marcasite

Reference List:
Buerger (1937) American Mineralogist: 22: 48.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 311-315.

Acta Chemica Scandinavica (1973): 27: 2791-2796.

Fleet, M.E. (1975b) Structural chemistry of marcasite and pyrite type phases. Zeitschrift für Kristallographie: 142: 332-346.

Schoonen, M.A.A. and Barnes, H.L. (1991b) Reaction forming pyrite and marcasite from solution II. Via FeS precursors below 100° C. Geochimica et Cosmochimica Acta: 55: 1505-1514.

Fleet, M.E. and Mumin, A.H. (1997) Gold-bearing arsenian pyrite and marcasite and arsenopyrite from Carlin-trend gold deposits and laboratory synthesis. American Mineralogist: 82: 182-193.

Gaines, Richard V., H. Catherine, W. Skinner, Eugene E. Foord, Brian Mason, Abraham Rosenzweig (1997), Dana's New Mineralogy : The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana: 120.

Uhlig, I., Szargan, R., Nesbitt, H.W., and Laajalehto, K. (2001) Surface states and reactivity of pyrite and marcasite. Appl. Surf. Sci.: 179: 223-230.

Yang, H., Downs, R.T., Eichler, C. (2008): Safflorite, (Co,Ni,Fe)As2, isomorphous with marcasite. Acta Crystallographica, E64, i62.

H. Yang and R.T. Downs (2008), Crystal structure of glaucodot, (Co,Fe)AsS, and its relationships to marcasite and arsenopyrite, American Mineralogist 93, 1183-1186

Internet Links for Marcasite

Specimens:
The following Marcasite specimens are currently listed for sale on minfind.com.

Localities for Marcasite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 21, 2015 14:18:32 Page generated: April 20, 2015 05:57:00