Jamesonite - Encyclopedia

    Class : Sulphides and sulfosalts
    Subclass : Sulfosalts
    Crystal system : Monoclinic
    Chemistry : Pb4FeSb6S14
    Rarity : Uncommon


Jamesonite is an uncommon sulfosalt of mid-temperature lead-antimony hydrothermal veins. Its name was given to it in honor of the Scottish mineralogist Robert Jameson. It is found, like boulangerite, semseyite, zinkenite or plagionite, in veins with a dominant stibnite invaded by lead fluids, or in veins with galena and sphalerite infiltrated by antimony fluids. It appears in fibrous, acicular or filiform crystals, sometimes prismatic striated according to elongation, or in fibrous masses. Jamesonite readily weathers at outcrops to mixtures of antimony and lead oxides. The color is lead gray and the luster metallic. It is occasionally an ore of antimony, more rarely of lead.

Jamesonite in the World

Splendid aggregates made up of fluffy or fibrous tufts come from Baia Sprie (Romania), from Pribram (Czech Republic). But the most remarkable samples come from mines in the district of Fresnillo (Zacatecas, Mexico): they are fibrous masses composed of acicular crystals reaching 5 cm by 3 mm. Masses of fibrous crystals are also known in English Cornwall (district of St-Endellion), and in Bolivia (Huanuni, Machacamarca).

Jamesonite in France

In France, jamesonite was common in the Peschadoires vein (Pontgibaud, Puy-de-Dôme), in several antimony veins in the Massiac region (Cantal), and in the gold-bearing veins of Pontvieux (Puy-de-Dôme).

Twinning

Twins are known on {100}.

Fakes and treatments

No fake identified for this mineral species.



Hardness : 2.5
Density : 5.63
Fracture : Irregular
Streak : Gray-black




TP : Opaque
RI : Not measurable
Birefringence : Not measurable
Optical character : None
Pleochroism : None
Fluorescence : None


Solubility : Nitric acid


Magnetism : None
Radioactivity : None

ReCaptcha

This service is used to secure web forms of our website and required if you want to contact us. By accepting it you agree to Google's privacy policy: https://policies.google.com/privacy

Google Analytics

Google Analytics is a service used on our website that tracks, reports traffic and measures how users interact with our website content in order for us to improve it and provide better services.

Facebook

Our website allows you to like or share its content on Facebook social network. By activating and using it you agree to Facebook's privacy policy: https://www.facebook.com/policy/cookies/

YouTube

Integrated videos provided by YouTube are used on our website. By accepting to watch them you agree to Google's privacy policy: https://policies.google.com/privacy

Twitter

Integrated tweets and share services of Twitter are used on our website. By accepting and using these you agree to Twitter's privacy policy: https://help.twitter.com/en/rules-and-policies/twitter-cookies

PInterest

Our website allows you to share its content on PInterest social network. By activating and using it you agree to PInterest's privacy policy: https://policy.pinterest.com/en/privacy-policy/