- Rutile, Brookite
- Thumbnail, 2.3 x 2.3 x 1.5 cm
- Magnet Cove, Hot Spring Co., Arkansas, USA
A titanium paramorph of high quality, this cluster of lustrous, black crystals of rutile having replaced brookite features crystals that are doubly terminated, with the largest one reaching 2.0 cm in length. Ex. Carnegie Museum Collection.