Ref.: Rocks & Min.: 62:407-415 (list on 409). Topsham is located about 25 miles NE of Portland, ME. The mineralization is a mile-wide belt of granitic pegmatites originally operated as feldspar quarries in a large district. Numerous world-famous radioactive mineral outcrops cover an area of several square kilometers from Standpipe Hill in the west near the Androscoggin River to the Cathance River in the east. The uraninite, monazite-(Ce), and ishakawaite minerals are particularly radioactive as they contain varying small amounts of thorium.
Mineral ListMineral list contains entries from the region specified including sub-localities
86 entries listed. 59 valid minerals.
Localities in this Region
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
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Locality Updated: Wheal Coates, St Agnes, St Agnes District, Cornwall, England, UKFrom David Ifold, 19th Jun 2013 22:44:10