molecular formula of copper pyrite
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Copper-pyrites - Encyclopedia
COPPER-PYRITES, or Chalcopyrite, a copper iron sulphide (CuFeS2), an important ore of copper. The name copper-pyrites is from the Ger. Kupferkies, which was used as far back as 1546 by G. Agricola; chalcopyrite (from XaXK6s, " copper," and pyrites) was proposed by J. F. Henckel in his Pyritologia, oder Kiess-Historie (1725). By the ancients copper-pyrites was included with other minerals under the term pyrites, though the copper-ore from Cyprus referred to by Aristotle as chalcites may possibly have been identical with this mineral.
Chalcopyrite crystallizes in the tetragonal system with inclined hemihedrism, but the form is so nearly cubic that it was not recognized as tetragonal until accurate measurements were made in 1822. Crystals are usually tetrahedral in aspect, owing to the large development of the sphenoid P {rill. The faces of this form are dull and striated, whilst the smaller faces of the complementary sphenoid P' {i r r } (fig. i) are bright and smooth. The combination of these two forms produces a figure resembling an octahedron, the angle between P and P' being 70° 72', corresponding to the angle 70° 32' of the regular octahedron. The other faces shown in fig. I are the basal pinacoid, a {oor}, and two square pyramids, b { 'or } and c { 2011. Crystals are usually twinned, and are often complex and difficult to decipher. There are three twin-laws, the twin-planes being (iii), (Ioi) and (rio) respectively. Twinning according to the first law is effected by rotation about an axis normal to the sphenoidal face (III), the resulting form resembling the twins of blende and spinel.
Answer:
the molecular formula of copper pyrite is
CUFeS2
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