The meeneral pyrite, or iron pyrite, forbye kent as fuil's gowd, is an iron sulfide wi the formula FeS2. This mineral's metallic luster an fauch brass-yellae hue gie it a superficial resemblance tae gowd (that's hou it gets the weel-kent eikname o fuil's gowd). The colour haes led tae the eiknames brass, brazzle, an Brazil an aw, primarily uised tae refer tae pyrite foond in coal.[5][6]

Pyrite
2780M-pyrite1.jpg
Pyrite cubic crystals on marl frae Navajún, Rioja, Spain (size: 95 bi 78 millimetres (3.7 bi 3.1 in), 512 grams (18.1 oz); main crystal: 31 millimetres (1.2 in) on edge)
General
CategorySulfide meeneral
Formula
(repeatin unit)
FeS2
Strunz clessification02.EB.05a
Dana clessification2.12.1.1
Creestal seestemIsometric
Space groupIsometric diploidal
Space group: Pa3
H-M seembol: 2/m3
Unit cella = 5.417 Å, Z=4
Identification
Formula mass119.98 g/mol
ColourFauch brass-yellae reflective; tarnishes darker an iridescent
Creestal habitCubic, faces mey be striatit, but frequently octahedral an pyritohedron an aw. Aften inter-grown, massive, radiatit, granular, globular, an stalactitic.
TwinninPenetration an contact twinnin
CleavageIndistinct on {001}; pairtins on {011} an {111}
FracturVera uneven, whiles conchoidal
TenacityBrickle
Mohs scale haurdness6–6.5
SkinkleMetallic, glistenin
StreakGreenish-black tae brounish-black
DiaphaneityOpaque
Speceefic gravity4.95–5.10
Density4.8–5 g/cm3
Fusibility2.5–3 to a magnetic globule
SolubilityInsoluble in watter
Ither chairacteristicsparamagnetic
References[1][2][3][4]

ReferencesEedit

  1. Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., John Wiley and Sons, New York, pp 285–286, ISBN 0-471-80580-7
  2. Pyrite on webmineral. Webmineral.com. Retrieved on 2011-05-25.
  3. Pyrite on. Mindat.org. Retrieved on 2011-05-25.
  4. Handbook of Mineralogy. (PDF) . Retrieved on 2011-05-25.
  5. Julia A. Jackson, James Mehl and Klaus Neuendorf, Glossary of Geology, American Geological Institute (2005) p. 82.
  6. Albert H. Fay, A Glossary of the Mining and Mineral Industry, United States Bureau of Mines (1920) pp. 103–104.