Locality type: Tunnel Classification Species: Brookite Formula: TiO2 Comments: In hydrotermally altered Rotondo granite, at ca. 2255 m from the portal, in association with aeschynite-(Y), anatase, gadolinite-(Y), magnetite, synchysite-(Ce), and xenotime-(Y). Confirmation Validity: Believed Valid Data Mineral Data: Click here to view Brookite data Locality Data: Click here to view Ronco tunnel (Bedretto window; Ronco window) [south section], Ronco, Bedretto, Leventina, Ticino, Switzerland Data Identifiers Mindat Occurrence Record ID: 436712 Long-form Identifier: 1:3:436712:3 GUID (UUID V4 ): 0 References Search for references including Brookite Ronco tunnel (Bedretto window; Ronco window) [south section], Ronco, Bedretto, Leventina, Ticino, Switzerland