Crystals sold as Tapiolite-(Mn) has been showed by analysis (XRD & microprobe) to be "pseudotetragonal" tantalite-(Mn). (Info by Ilkka Mikkola 19.10.2011)
-Sandström, F. & Lahti, S.I. (2009): Viitaniemipegmatiten i Eräjärvi, Orivesi, Finland. Litofilen 26 (1): 11-38
119 entries listed. 105 valid minerals. 3 type localities (valid minerals). 1 erroneous literature entry.
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