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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. Low humidity (less than 60% ...
Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite is more stable and less brittle than marcasite. Marcasite can also react with moisture to form sulfuric acid. These are the reasons why pyrite is used instead of real marcasite in "marcasite" jewellery.
A newer commercial use for pyrite is as the cathode material in Energizer brand non-rechargeable lithium metal batteries. [20] Pyrite is a semiconductor material with a band gap of 0.95 eV. [21] Pure pyrite is naturally n-type, in both crystal and thin-film forms, potentially due to sulfur vacancies in the pyrite crystal structure acting as n ...
Common goethite pseudomorphs include pyrite, siderite, and marcasite, though any iron(II)-bearing mineral could become a goethite pseudomorph if proper conditions are met. It may also be precipitated by groundwater or in other sedimentary conditions, or form as a primary mineral in hydrothermal deposits.
Pyrite FeS 2; Marcasite FeS 2; Molybdenite MoS 2; Sulfarsenides: Cobaltite (Co,Fe)AsS; Arsenopyrite FeAsS; Gersdorffite NiAsS; Sulfosalts: Pyrargyrite Ag 3 SbS 3; Proustite Ag 3 AsS 3; Tetrahedrite Cu 12 Sb 4 S 13; Tennantite Cu 12 As 4 S 13; Enargite Cu 3 AsS 4; Bournonite PbCuSbS 3; Jamesonite Pb 4 FeSb 6 S 14; Cylindrite Pb 3 Sn 4 FeSb 2 S 14
Marcasite, orthorhombic FeS 2; Pyrite, cubic FeS 2 (fool's gold) Arsenopyrite (mispickel), FeAsS, or Fe(As-S), Fe(III) mixed arseno-sulfide (monoclinic) Synthetic.
Before the advent of steel, a variety of iron pyrite or marcasite was used with flint and other stones to produce a high-temperature spark that could be used to create fire. [4] There are indications that the Iceman, also known as Ötzi, may have used iron pyrite to make fire. [5]
But virtually his entire discussion of pyrite as gem is on page 199 and reads: "The Colorado crystals are compact enough to cut into the faceted gem known in Europe as 'marcasite,' which was extensively mounted in gold during the last century, but has been almost entirely superseded by the introduction of bright steel jewelry."
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