Pegmatite.
Tantalum was discovered in ore from Kimito (and Ytterby, Sweden).
Ref:
Ann. d. Phys, u. Chem. (1857) 4th ser. II, 625-634
http://www.minsocam.org/ammin/AM48/AM48_961.pdf
http://zs.thulb.uni-jena.de/servlets/MCRFileNodeServlet/jportal_derivate_00141493/18571770807_ftp.pdf
Am Min (1963) 48 (9-10), 961-979
http://www.minsocam.org/ammin/AM48/AM48_961.pdf
GFF (1899) 21, 639-640
GFF (1941) 63, 295-299
References
A. Laitakari; Bull de la Commission Géologique, no 230
Mineral List
24 entries listed. 16 valid minerals. 1 type locality (valid mineral).
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.
Mineral and Locality Search
