Great pyrite heart in a stand from Peru

A pyrite heart from Peru in a metal stand. The polished surface displays the characteristic smooth pyrite polish, a material property directly related to the material's hardness.

Pyrite (Mohs 6.5) polishes well to a high luster. Its luster is 'metallic', unlike gemstones with 'adamantine' or 'vitreous' luster. This metallic reflection creates a specific optical impression that occurs only in metals, sulfides, and some oxides.

The golden luster is due to the specific electron reflection spectrum of iron sulfide: short-wavelength light (blue) is absorbed, while long-wavelength light (yellow-red) is reflected, resulting in the characteristic golden hue.

Peruvian pyrite deposits in Huanzala supply the material; the cutting and processing are done in specialized workshops in Lima.

A Peruvian collector's item with documented metallic polish classification and electron-spectroscopic luster explanation.