A Geoscience Digital Image Library

TitleBournonite with siderite from Neudort, Germany
DescriptionBournonite, CuPbSbS3 (copper lead antimony sulfide), with siderite (brownish material making up most of the specimen). Bournonite (several small steel gray grains in this specimen) is also called “cog wheel ore” because of the cog wheel shape that the twinned crystals form. Twinning is common in bournonite and if a crystal repeatitively twins it can form a type of twin called a trilling. This specimenis 7 cm across.
LocationGermany. Near Neudort.
PhotographerDarla Sondrol. 2001-07-11.
CollectionUniversity of North Dakota Mineralogy Collection #261.
Key wordsbournonite, siderite, Germany
Tech details742 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number1143