- Chemistry: Ag3Sb, Silver Antimonide
- Class: Sulfides
- Subclass: Antimonides
- Uses: Mineral specimens and as a minor ore of silver.
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
because antimony is really a semi-metal and not a metal like silver.
Dyscrasite forms intricate and strikingly beautiful crystals and crystal
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
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
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
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,
- Best Field Indicators are crystal habit, streak, density, color,
tarnish and luster.