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Mineralpedia Details for Jamesonite

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Jamesonite

Jamesonite

Named to honor Robert Jameson, the Scottish mineralogist who was the first to describe the mineral. Jamesonite is a relatively common mineral with numerous localities including in England, Germany, the Czech Republic, Romania, Bolivia, Mexico, the United States, and China, which are all known for rich material. Jamesonite forms as a late stage mineral in lead-silver-zinc veins that formed at low to medium temperatures. Associated minerals include other lead sulfosalts, pyrite, sphalerite, galena, tetrahedrite, stibnite, quartz, siderite, calcite, dolomite, and rhodochrosite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/jamesonite.pdf

Formula
Pb4FeSb6S14 
Crystal System
Monoclinic 
Crystal Habit
Acicular, Radial, Massive - Fibrous 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
lead gray, steel gray, dark lead gray 
Streak
black. grayish 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2.5 
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Jamesonite from Mapimi dist., Durango, Mexico

Jamesonite
            from Mapimi dist., Durango, Mexico

Large cabinet specimen with face covered by filliform Jamesonite crystals associated with Pyrite.

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Jamesonite from St. Endellion, Cornwall, England

Jamesonite
            from St. Endellion, Cornwall, England

Compact silvery fibrous metallic masses in Quartz. 

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Jamesonite from Wallace, Coeur d'Alene District, Shoshone Co., Idaho, United States

Jamesonite
            from Wallace, Coeur d'Alene District, Shoshone Co., Idaho, United States

Tightly compacted acicular crystals of Jamesonite, an ore of lead.

This historic mining district is one of the world's largest concentrations of silver and has produced over 1.18 billion ounces of silver since 1884. Lead, zince, copper, and antimony has also contributed to over $2.89 billion worth of production. The district is located in the panhandle of Idaho and within the Coeur d'Alene Mountains of the the Bitterroot Range. The mines are hosted by the 1.4 BYA Proterozoic Belt Supergroup rocks.

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