Paramontroseite (VO2) is a relatively rare mineral in the Ramsdellite group that has anomalously radioactive masses, which is mostly caused by specks of coffinite that is a uranium-bearing, silicate mineral,  that occurs as black incrustations in thin sections and is found in a few places in the USA, such as Fall River County, South Dakota, that is named for Fall River that runs through it.
Paramontroseite (VO2) is a relatively rare mineral in the Ramsdellite group that has anomalously radioactive masses, which is mostly caused by specks of coffinite that is a uranium-bearing, silicate mineral,  that occurs as black incrustations in thin sections and is found in a few places in the USA, such as Fall River County, South Dakota, that is named for Fall River that runs through it.