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- Marcasite abstract "The mineral marcasite, sometimes called white iron pyrite, is iron sulfide (FeS2) with orthorhombic crystal structure. It is physically and crystallographically distinct from pyrite, which is iron sulfide with cubic crystal structure. Both structures do have in common that they contain the disulfide S22- ion having a short bonding distance between the sulfur atoms. The structures differ in how these dianions are arranged around the Fe2+ cations. Marcasite is lighter and more brittle than pyrite. Specimens of marcasite often crumble and break up due to the unstable crystal structure.On fresh surfaces it is pale yellow to almost white and has a bright metallic luster. It tarnishes to a yellowish or brownish color and gives a black streak. It is a brittle material that cannot be scratched with a knife. The thin, flat, tabular crystals, when joined in groups, are called "cockscombs." In marcasite jewellery, pyrite used as a gemstone is termed "marcasite". That is, marcasite jewellery is made from pyrite not from marcasite. In the late medieval and early modern eras the word "marcasite" meant both pyrite and marcasite (and iron sulfides in general). The narrower, modern scientific definition for marcasite as orthorhombic iron sulfide dates from 1845. The jewellery sense for the word pre-dates this 1845 scientific redefinition. Marcasite in the scientific sense is not used as a gem due to its brittleness.".
- Marcasite thumbnail MarcassiteII.jpg?width=300.
- Marcasite wikiPageExternalLink pyrite6.htm.
- Marcasite wikiPageID "1094182".
- Marcasite wikiPageRevisionID "543722839".
- Marcasite caption "Marcasite with tarnish".
- Marcasite category Sulfide_minerals.
- Marcasite cleavage "Cleavage: {101}, rather distinct; {110} in traces".
- Marcasite color "Tin-white on fresh surface, pale bronze-yellow, darkening on exposure, iridescent tarnish".
- Marcasite diaphaneity "Opaque".
- Marcasite formula "FeS2".
- Marcasite fracture "Irregular/Uneven".
- Marcasite gravity "4.875".
- Marcasite habit "Crystals typically tabular on {010}, curved faces common; stalactitic, reniform, massive; cockscomb and spearhead shapes due to twinning on {101}.".
- Marcasite hasPhotoCollection Marcasite.
- Marcasite luster "Metallic".
- Marcasite mohs "6".
- Marcasite molweight "119.98".
- Marcasite name "Marcasite".
- Marcasite pleochroism "[100] creamy white; [010] light yellowish white; [001] white with rose-brown tint. Anisotropism: Very strong, yellow through pale green to dark green".
- Marcasite streak "Dark-grey to black.".
- Marcasite strunz "2".
- Marcasite symmetry "Orthorhombic 2/m 2/m 2/m".
- Marcasite system "Orthorhombic, Pnnm".
- Marcasite tenacity "Brittle".
- Marcasite twinning "Common and repeated on {101}; less common on {011}.".
- Marcasite unitCell "a = 4.436 Å, b = 5.414 Å, c = 3.381 Å; Z = 2".
- Marcasite wordnet_type synset-mineral-noun-1.
- Marcasite subject Category:Alchemical_substances.
- Marcasite subject Category:Iron_minerals.
- Marcasite subject Category:Orthorhombic_minerals.
- Marcasite subject Category:Sulfide_minerals.
- Marcasite type Abstraction100002137.
- Marcasite type AlchemicalSubstances.
- Marcasite type IronMinerals.
- Marcasite type Material114580897.
- Marcasite type Matter100020827.
- Marcasite type Mineral114662574.
- Marcasite type OrthorhombicMinerals.
- Marcasite type Part113809207.
- Marcasite type PhysicalEntity100001930.
- Marcasite type Relation100031921.
- Marcasite type Substance100019613.
- Marcasite type SulfideMinerals.
- Marcasite type ChemicalSubstance.
- Marcasite type Mineral.
- Marcasite type ChemicalObject.
- Marcasite type Thing.
- Marcasite comment "The mineral marcasite, sometimes called white iron pyrite, is iron sulfide (FeS2) with orthorhombic crystal structure. It is physically and crystallographically distinct from pyrite, which is iron sulfide with cubic crystal structure. Both structures do have in common that they contain the disulfide S22- ion having a short bonding distance between the sulfur atoms. The structures differ in how these dianions are arranged around the Fe2+ cations.".
- Marcasite label "Marcasiet".
- Marcasite label "Marcasita".
- Marcasite label "Marcasite".
- Marcasite label "Marcasite".
- Marcasite label "Marcassita".
- Marcasite label "Marcassite".
- Marcasite label "Markasit".
- Marcasite label "Markasyt".
- Marcasite label "Марказит".
- Marcasite label "白鉄鉱".
- Marcasite label "白铁矿".
- Marcasite sameAs Markazit.
- Marcasite sameAs Markasit.
- Marcasite sameAs Μαρκασίτης.
- Marcasite sameAs Marcasita.
- Marcasite sameAs Markasita.
- Marcasite sameAs Marcassite.
- Marcasite sameAs Marcasite.
- Marcasite sameAs 白鉄鉱.
- Marcasite sameAs Marcasiet.
- Marcasite sameAs Markasyt.
- Marcasite sameAs Marcassita.
- Marcasite sameAs m.045gky.
- Marcasite sameAs Q409087.
- Marcasite sameAs Q409087.
- Marcasite sameAs Marcasite.
- Marcasite wasDerivedFrom Marcasite?oldid=543722839.
- Marcasite depiction MarcassiteII.jpg.
- Marcasite isPrimaryTopicOf Marcasite.
- Marcasite name "Marcasite".