TR64I8: Dipyramidal, very sharp and doubly terminated crystal with small crystals of Brookite and Quartz, on matrix. The sample is with a label from the Comptoir Minéralogique & Géologique Suisse, of Geneva.
Piz Aul, Vals Valley, Vals, Surselva Region, Grischun (Grisons; Graubünden)  Switzerland

Specimen size: 5.3 × 3.9 × 3.7 cm = 2.09” × 1.54” × 1.46”

Main crystal size: 0.6 × 0.3 cm = 0.24” × 0.12”