Mineralpedia Details for Pyrostilpnite
Originally called Feuerblende, a combination of the German words for “fire,” feuer, and “to blind,” blenden and was later changed to the Greek translation of pyr, meaning “fire,” and stilpnos, meaning “bright or shining,” in reference to the color and luster of the mineral. Found in just a few localities as a late-stage mineral as hydrothermal veins of low temperature.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/pyrostilpnite.pdf
Pyrostilpnite from Cerro de Potosí, Potosí City, Potosí dept., Bolivia
Deep, bright red acicular crystals to 1mm in vuggy sulfide matrix.
Pyrostilpnite from Pribram, Bohemia, Czech Republic
A divergent ruby red sprays to 4mm.
Pyrostilpnite from St. Andreasberg dist., Harz, Lower Saxony, Germany
Bladed groups of cherry red Pyrostilpnite to 3mm.