Andorite IV

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Andorite IV
Andorite - Itos Mine, Oruro City, Cercado, Oruro Department, Bolivia.jpg
Location: Itos Mine, Oruro City, Province of Cercado, Oruro Department, Bolivia - total size of the sample: 4.1 cm
General and classification
chemical formula AgPbSb 3 S 6
Mineral class
(and possibly department)
Sulfides and sulfosalts
System no. to Strunz
and to Dana
2.JB.40a ( 8th edition : II / E.23)
Crystallographic Data
Crystal system orthorhombic
Crystal class ; symbol orthorhombic-dipyramidal 2 / m 2 / m 2 / m
Twinning after {110}
Physical Properties
Mohs hardness 3 to 3.5
Density (g / cm 3 ) 5.38 to 5.44
Cleavage no
Break ; Tenacity shell-like
colour gray to dark gray, yellow to brightly colored
Line color black
transparency opaque
shine Metallic luster

Andorite IV (originally andorite , synonym quatrandorite ) is a rarely occurring mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the orthorhombic crystal system with the chemical composition AgPbSb 3 S 6 and develops opaque, prismatic or tabular, striped crystals , but also massive aggregates of gray color. In the air, the mineral turns yellow or brightly colored after a while due to " oxidation ".

Etymology and history

Andorite IV was named after the Hungarian nobleman, mineral collector and hobby mineralogist Andor von Semsey (1833-1923). It was first found and described in 1892 in the Baia Sprie mine in Romania.

Education and Locations

Andorite IV forms mainly hydrothermally in various lead (Pb) and silver (Ag) deposits . Accompanying minerals include jamesonite , cassiterite and stannite .

Locations include Jujuy and Salta in Argentina , Victoria in Australia , Oruro and Potosí in Bolivia , Hausach and Bräunsdorf / Oberschöna in Germany , Ontario in Canada , Baia Sprie in Romania , Třebsko in the Czech Republic and Nevada in the USA .


Andorite IV is occasionally used as a raw material for the extraction of silver when it is locally accumulated.

See also

Individual evidence

  1. IMA / CNMNC List of Mineral Names - Andorite IV and Andorite VI (English, PDF 1.29 MB; p. 6)


Web links

Commons : Andorite  - collection of images, videos and audio files