Crystal System: Tetragonal
Status of Occurrence: Confirmed Occurrence - 1st UK recording
Distribution: Rare
Chemical Composition: Titanium tantalum iron oxide
Chemical Formula: (Ti,Ta,Fe3+)3O6
Method(s) of Verification: Y Llymllwyd, Nant Ffrancon - XRD (D. Jenkins, University College of North Wales, Bangor)

Chemical Group:

  • Niobates and Tantalates

Geological Context:

  • Hydrothermal
  • Igneous
Introduction: strüverite is a rare mineral typically found as a late stage magmatic mineral in granite pegmatites. This mineral name is considered to be somewhat superfluous as strüverite compositions may be considered as tantalian rutile.
Occurrence in Wales: unpublished data provides the first UK occurrence of this mineral.

Key Localities:

  • Nant Ffrancon, Gwynedd: at Y Llymllwyd, near Nant Ffrancon, small prisms in altered microgranite, associated with brookite and gibbsite from this locality have been identified as strüverite on the basis of X-ray diffraction analysis.


There are no references for this specimen.