Penroseite

  
Steel, bright metallic grains
  
Black, dark grey, metallic crystal masses showing radial structure and botryoidal terminations. Also minor blue chalcomenite crystals are associated.
Origin: Pacajake mine, Colquechaca, Potosí, Bolivia (type locality)
Sample size: 2 x 1.5 x 1.5 cm (top), 2 x 1.5 x 1.5 cm (bottom)
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

Back to Alphabetical list Physical, chemical and crystallographic description Optical properties/Thin sections SEM images TEM images vibrational spectra description IR spectra Raman spectra N-IR spectra F-IR spectra IES spectra