Mineral Information and Data:

Jamesonite
Pb4FeSb6S14 [CNMNC approved formula]

Named in honor of Robert Jameson (1774–1854), Scottish mineralogist, Edinburgh, Scotland, who first described the mineral.

IMA status : Valid species (Pre-IMA 1825) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
03.06.07.01  
  (03) Sulfides - Sulfosalts
  (03.06) where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.06.07)
  
Nickel-Strunz
(10th edition) :
02.HB.15
  (02) Sulfides
  (02.H) Sulfosalts of SnS Archetype
  (02.HB) With Cu, Ag, Fe, Sn and Pb
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 15.65 Ǻ, b = 19.03 Ǻ, c = 4.03 Ǻ, β = 91.8°
Crystal Habit: Crystals acicular to fibrous; felt-like aggregates; columnar aggregates; massive
Twinning: On {100}, lamellar
  
Color: Gray-black, may tarnish iridescent
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 2.5
Measured Density: 5.63 g/cm3
Cleavage: 1; {001} good
Tenacity: Brittle
Streak: Gray-black
  
Polymorphism and Series: Dimorphous with parajamesonite. Forms a series with benavidesite.
Geologic Setting: Typically a late-stage hydrothermal mineral in Pb–Ag–Zn veins formed at low to medium temperatures.
Mineral Association: Other lead sulfosalts, pyrite, sphalerite, galena, tetrahedrite, stibnite, quartz,
siderite, calcite, dolomite, rhodochrosite
  
Synonyms/varieties: Axotomous Antimony, Tinder Ore

 

Jamesonite
Origin: Sombrerete, Zacatecas, Mexico
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Jamesonite
Origin: Alexander Lode, Silver City district, Pennington Co., South Dakota, USA
Sample size: 4 x 2.5 x 2 cm (SEM and XRD confirmed)
Photo: Tom Loomis

 

Jamesonite
Long, prismatic silvery crystals to 3 cm piercing calcite crystals associated with chalcopyrite.
Origin: Sombrete, Mexico
Sample size: 5 x 4 x 4 cm
Photo: Tom Loomis

 

Jamesonite
(zoom-in of above)

 

Jamesonite
This speicmen of quartz has abundant matted, hair-like crystals of jamesonite. Also present are small crystals of lustrous sphalerite to 2 mm.
Origin: Felsobanya, Siebenburgen, Romania
Sample size: 7.8 x 6.5 x 4 cm
Photo: John Veevaert, Trinity Mineral Co

 

Jamesonite
(zoom-in of above)

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