• Chemistry: Ag3Sb, Silver Antimonide
  • Class: Sulfides
  • Subclass: Antimonides
  • Uses: Mineral specimens and as a minor ore of silver.
  • Specimens

Dyscrasite is a very interesting, rare and beautiful silver mineral that is popular with collectors who love to collect silver bearing minerals especially micromounted specimens. Dyscrasite is actually an alloy of the silver and antimony which means the atoms of silver and antimony are combined with metallic bonds instead of ionic or covalent bonds. Alloys are usually placed in the Elements Class. But dyscrasite is placed in the Sulfide Class because antimony is really a semi-metal and not a metal like silver.

Dyscrasite forms intricate and strikingly beautiful crystals and crystal aggregates. Its metallic silver-white color rivals the beautiful color of silver itself. The crystals, although usually quite small, are never-the-less quite detailed and reminiscent of something out of this world. Forms include arborescent (branching) and cyclic pseudo-hexagonal twinned crystals. Dyscrasite is locally an important ore of silver.


  • Color is silver-white.
  • Luster is metallic.
  • Transparency: Crystals are opaque.
  • Crystal System: Orthorhombic; 2/m 2/m 2/m.
  • Crystal Habits include intricate arborescent and prismatic striated crystals. Cyclic twinned crystals are pseudo-hexagonal (six-sided) prisms and pyramids, but these are especially rare. Commonly found massive.
  • Cleavage: Not discernible.
  • Fracture: Hackly.
  • Hardness is 3.5 - 4
  • Specific Gravity is 9.4 - 10 (very heavy for metallic minerals).
  • Streak is silver.
  • Other Characteristics: Specimens will tarnish to a yellow or black color with exposure to light.
  • Associated Minerals include calcite, silver and silver ore minerals.
  • Notable Occurrences include Wolfach and the Harz Mountains of Germany; Pribram, Czech Republic; Broken Hill, New South Wales, Australia; Pima and Santa Cruz Counties, Arizona, USA; Atacama, Chile and Cobalt, Ontario, Canada.
  • Best Field Indicators are crystal habit, streak, density, color, tarnish and luster.
DYSCRASITE specimens:
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DYSCRASITE specimen dys-1
$ 150.00
Dims: 0.6 x 0.5 x 0.2" (1.6 x 1.2 x 0.5 cm)
Wt: 10 g w/ specimen box
Pibram, Czech Republic
This small thumbnail piece consists of a small, arborescent Dyscrasite formation. Though the formation appears to be broken and incomplete upon first glance, one can see actual termainations on all of the edgeward surfaces. Though somewhat warped, its orthorhombic form is reasonably good, and it shows a somewhat tarnished silvery color and a slightly dull metallic luster. There is no host rock present, and the piece is affixed inside a plastic thumbnail box with hot glue.
no photo
dys-1 ($150.00)
Pibram, Czech Republic
DYSCRASITE specimen dys-2
$ 95.00
Dims:0.5x0.4x0.2" (1.3x1.0x0.5 cm)
Wt: 0.3oz. (9g)w/box
Pibram, Czech Republic
This specimen consists of several prismatic crystals of dyscrasite on a black matrix of what I believe to be silver sulfides. The largest dyscrasite crystal measures 0.3" (0.8cm) in length. The end of the specimen reveals a dyscrasite crystal wrapped in concentric layers of the black matrix material. This may indicate that the black material might be an alteration product of the dyscrasite. All of the dyscrasite crystals show varying degrees of damage; there are no termination faces present. This specimen is affixed to a small plastic box for protection.
no photo
dys-2 ($ 95.00)
Pibram, Czech Republic
DYSCRASITE specimen dys-3
$ 75.00
Dims:0.6x0.5x0.2" (1.5x1.3x0.5 cm)
Wt: 0.5oz. (13g)w/box
No. 21 MIne, Pibram, Czech Republic
This specimen consists of a dyscrasite crystal resting on a matrix of arsenic. There is a second fragment of dyscrasite directly to the right of the primary crystal. The primary crystal measures 0.4" (1.0cm) in length. There is no damage to this specimen. It is mounted in a plastic "perky" box.
no photo
dys-3 ($ 75.00)
No. 21 MIne, Pibram, Czech Republic


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