Mineralogy Photography

Bournonite

bournonite (2)

 

Structural info:

bournonite

Name origins:

The mineral is named after the French mineralogist Jacques Louis Comte de Bournon. It was previously named endellionite after the locality where it was found for the first time.

Description:

Bournonite is a sulfosalt of lead, copper and antimony. The mineral crystallizes in orthorombic crystal system and it usually forms tabular crystals. Twinning on {110} is very common forming so-called “cogwheels”. The photos of the specimen presented show this phenomenon. The crystals of the mineral have a metallic look but develop a tarnish throughout the time . The mineral is formed in moderature temperature hydrotheraml veins along with sphalerite, galenite, jamesonite, quartz, etc. The mineral is quite abundant and can be found everywhere around the world. The best pieces come from Bolivia, Viboras mine. Well formed and large crystals were alsou found in France, Les Malines mine.

bournonite (1)

 Bournonite, Baia Sprie, Romania. 

 Canutillos Mine, Machacamarca District (Colavi District), Bolivia

 

 Les Malines mine, France (14.5x12x7 cm)