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Mineralpedia Details for Pyrostilpnite

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Pyrostilpnite

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

Formula
Ag3SbS3 
Crystal System
Monoclinic 
Crystal Habit
Acicular, Crystalline - Fine 
Cleavage
Perfect, None, None 
Luster
Adamantine 
Color
hyacinth red, orange red 
Streak
orange yellow 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
WebMineral
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Mindat
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Pyrostilpnite from Cerro de Potosí, Potosí City, Potosí dept., Bolivia

Pyrostilpnite
            from Cerro de Potosí, Potosí City, Potosí dept., Bolivia

Deep, bright red acicular crystals to 1mm in vuggy sulfide matrix.

Click thumbnail images for larger view.

Pyrostilpnite from Pribram, Bohemia, Czech Republic

Pyrostilpnite
            from Pribram, Bohemia, Czech Republic

A divergent ruby red sprays to 4mm.

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Pyrostilpnite from St. Andreasberg dist., Harz, Lower Saxony, Germany

Pyrostilpnite
            from St. Andreasberg dist., Harz, Lower Saxony, Germany

Bladed groups of cherry red Pyrostilpnite to 3mm.

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