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This article is about the mineral. For various cities and towns of that name, see Galena (disambiguation).
Galena
Galena (Lead sulfide) from Galena, Kansas, USA
General
Category Mineral
Chemical formula lead sulfide (PbS)
Identification
Colour Lead gray, silvery
Crystal habit Cubes, tabular and sometimes skeletal crystals
Crystal system Isometric hexoctahedral
Cleavage Cubic
Fracture Flat (when cubic) to even
Mohs Scale hardness 2.5 - 2.75
Luster Metallic
Refractive index Opaque
Pleochroism None
Streak Lead gray
Specific gravity 7.4 - 7.6
Fusibility 2

Galena is a lead ore. This article describes Galena's mineral properties. In its chemically purified form, galena is known as lead sulfide; refer to that article for chemical and industrial uses.

Galena is one of the most abundant and widely distributed sulfide minerals, and is the most common ore of lead. Crystals are usually cubic, sometimes octahedral. It is often associated with the minerals sphalerite and fluorite. Galena deposits sometimes contain significant amounts of silver as an impurity, and these galenas have long been the most important ore of silver in mining.

Galena from Poland


Galena deposits are found in Germany, France, Romania, Austria, Belgium, Italy, Spain, Scotland, England, Australia, and Mexico. In the United States it occurs in Missouri, Illinois, Iowa, Kansas, Oklahoma, Colorado, Idaho, Utah, Montana, and Wisconsin. Galena is the official state mineral of Missouri and Wisconsin, USA. Galena also occures at Mount Hermon in Northern Israel. In ancient Israel it was used to colour eyes blue.

Uses

Galena was once used as a semiconductor (i.e. the crystal) in crystal radio sets; combined with a safety pin or similar sharp wire (known as a "cat's whisker"), the galena crystal became part of a point-contact diode used to detect radio signals.


See also

  • List of minerals
  • The Lead Belt, a major galena mining region in Missouri.
  • lead
  • Lead sulfide

External links

  • Case Studies in Environmental Medicine (CSEM): Lead Toxicity
  • ToxFAQs™: Lead
  • Webmineral.com entry for galena
  • Mineral information institute entry for lead
  • Franklin and Sterling Hill mineral deposits
 This article about a specific mineral, mineraloid, or rock type is a stub. You can help Wikipedia by expanding it.

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