Dyscrasite

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Dyscrasite specimen - rock identification

What is Dyscrasite?

The silver antimonide mineral dyscrasite has the chemical formula Ag3Sb. It is an opaque, silver white, metallic mineral which crystallizes in the orthorhombic crystal system. It forms pyramidal crystals up to 5 cm (2.0 in) and can also form cylindrical and prismatic crystals.

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North ZoneCentral RidgeSouth Basin

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Key Characteristics

Characteristics of Dyscrasite

Dyscrasite is a metal ore and is opaque. In reflected light, however, it demonstrates weak anisotropism. Dyscrasite’s color under plane polarized light is most likely dark grey/black. When spun on a rotatable stage of a microscope (under plane polarized light), dyscrasite’s color should slightly change shades. This property is called pleochroism. Dyscrasite exhibits very weak reflected light pleochroism. Dyscrasite belongs to the orthorhombic crystal class, meaning all three of its axes (a, b, and c) are unequal in length and are 90° to each other.

Formation of Dyscrasite

It was first described for an occurrence in 1797 in the Wenzel Mine, Black Forest, Germany. The name dyscrasite comes from the Greek word δυσκράσις, meaning "a bad alloy." It occurs as a hydrothermal mineral in silver bearing veins in association with native silver, pyrargyrite, acanthite, stromeyerite, tetrahedrite, allemontite, galena, calcite and baryte.

Quick Facts

Physical Properties

Color
Silver White
Hardness (Mohs)
3.5 - 4
Density
9.72 g/cm³
Streak
Silver-white

Chemical Properties

Chemical Formula
Ag3Sb
Elements
Ag, Sb

Also Known As

DyscrasiteDiscrasiteStöchiolith
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