They are variously associated with a gangue of dolomite, calcite, quartz, iron pyrite, barite, and chert.
"The Economic Aspect of Geology"
C. K. Leith
The gangue is mainly fine-grained quartz or jasperoid, and barite.
"The Economic Aspect of Geology"
C. K. Leith
Germany is the world's principal producer of barite and has large reserves of high grade.
"The Economic Aspect of Geology"
C. K. Leith