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August 30, 2014

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Rutile, Ilmenite, Tivanite

Locality: Fazenda do Vadi claim, Diamantina, Jequitinhonha valley, Minas Gerais, Brazil

Posted by: Aleksander Rečnik

Classical (301) twin of rutile. The crystal has a high sub-metallic luster with deep-red translucent areas. Twins in rutile are not just simple contact twins, but contain a few-nm thick interface lamella of corundum structure. In the case of (301) twin the lamella is composed of Al-rich ilmenite originating from the (Ti,Fe,Al)-tivanite precursor, as shown in the recent HRTEM study! The specimen size 12x9x4 mm. Reference: • Nina Daneu, Herbert Schmid, Aleksander Rečnik, Werner Mader (2007) Atomic structure and formation mechanism of (301) rutile twins from Diamantina (Brazil). ...

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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