Pyrite in Quartz is quite common from many country. But as usual only
Brazil has a production of cut stones for jewelry and collection purpose.
Pyrite in quartz usually consists of shapeless masses. Well shaped crystals
are rare, and good size of the crystals also very rare. The crystal shape
of the pyrite crystals can vary: octahedron, pyritohedron or more complex
shapes. Cube is unusual in Brazil as is more common in quartz from Peru
or Spruce Claim, Washington.
Lacality where quartz with pyrite are found in Brazil are numerous,
most from the State of Minas Gerais.