Rutile with Hematite

specimen number:
2072258

location:
Ibitiara, Bahia, Brazil

description:
Beautiful golden needlelike crystals of rutile in a cluster with bright lustrous metallic platy crystals of hematite. In good condition.

The Ibitiara district, located in the Chapada Diamantina region of Bahia, Brazil, is a world-class locality for high-quality mineral specimens, particularly those found in alpine-type hydrothermal veins. Geologically, the deposit is hosted within the Proterozoic metasedimentary rocks of the Espinhaco Supergroup, where tectonic activity created open fissures and cavities during the Pan-African orogeny. These pockets are filled with a variety of minerals, including clear quartz, hematite, and rutile, which crystallized from mineral-rich fluids under high-pressure and moderate-temperature conditions. Historically, the area has been worked for decades by artisanal miners, known locally as garimpeiros, with significant specimen production ramping up in the late 20th century, specifically during the 1980s and 1990s. While there are no massive industrial quarrying operations for metallic ore in the immediate vicinity of the specimen pits, the small-scale hand-mining efforts have consistently provided the global market with some of the most aesthetic and geometrically perfect mineral associations found in South America.

Epitaxy is a geological and crystallographic phenomenon where one mineral grows upon the surface of another in a specific, shared orientation determined by the atomic structure of their respective crystal lattices. In the famous specimens from Ibitiara, rutile (titanium dioxide) often grows on the basal planes of hematite (iron oxide) in a spectacular six-rayed star pattern known as a hematite-rutile epitaxy. This occurs because the oxygen atoms in the hematite lattice provide a structural template that matches the spacing requirements for the rutile crystals to take root and grow outward at precise 60-degree angles. This oriented growth is not random; it is a physical manifestation of atomic harmony between two different mineral species, resulting in the "star" or "sun" formations that are highly prized by collectors for their mathematical and natural beauty.

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