Abstract
Abstract In 1957 a radioactive mineralization was found just north of the village Mönsterås on the east coast of southern Sweden opposite the island of Öland. There the bedrock consts of Pre-Cambrian granite and porphyry covered by Cambrian sandstone. The radioactive minerals are situated in the weathered layer under the sandstone and they consist of black coalrich fragments assumed to be thucholite. In the same area breccia with galena, fluorite and calcite is found As the contents of lead in the thucholite bearing arkose is high too we suppose that there exists a genetical relationship between the two types of mineralization. At another place more to the south, similar mineralizations were found and from earlier deep borings at Öland natural gas with helium and graphitic fragments in the quartzite under the Cambrian sandstones have been described.
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