Brandtite - Encyclopedia

    Class : Phosphates, arsenates, vanadates
    Subclass : Hydrated arsenates
    Crystal system : Monoclinic
    Chemistry : Ca2(Mn,Mg)(As2O4)2 2H2O
    Rarity : Rare


Brandtite is a rare hydrated arsenate of calcium and manganese, colorless or white, present in hydrothermal manganese deposits. Its name was given to it in honor of the Swedish chemist Georg Brandt. It is a mineral which forms small prismatic crystals up to 8 mm, frequently grouped in radiate aggregates, or spherules and reniform masses with fibroradiated textures.

Main photo : Brandtite from Harstigen Mine, Pajsberg, Sweden © Marko Burkhardt

Brandtite from Fuchs Quarry, Hartkoppe, Bavaria, Germany © Yannick Vessely
Brandtite from Veta Negra Mine, Atacama, Chile © Christophe Boutry
Brandtite from Fuchs Quarry, Hartkoppe, Bavaria, Germany © Carsten Slotta
Brandtite from Fuchs Quarry, Hartkoppe, Bavaria, Germany © Luigi Chiappino

Brandtite in the World

Brandtite occurs in the metamorphic manganese deposits of Sweden (Langban, Harstigen) and New Jersey (Sterling Hill), as well as in the rhodochrosite and rhodonite manganese veins of Schneeberg (Saxony), and Vrancice, near Pribram (Czech Republic).

Brandtite in France

Brandtite has been reported in France at the Salsigne mine (Aude).

Twinning

Common twin on {100}.

Fakes and treatments

No fake inventories for this mineral species.



Hardness : 3.5
Density : 3.67
Fracture : Conchoidal
Trace : White



TP : Translucent to transparent
RI : 1.707 to 1.729
Birefringence : 0.018
Optical character : Biaxial +
Pleochroism : None
Fluorescence : None


Solubility : Acids

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

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/