Very small orange brown single crystals of the extremely rare Fe-Ti oxide mineral kleberite from one of the cotype localities in Germany: Alluvial Sands, Königshain-Wiederau, Mittelsachsen, Saxony, Germany. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Kleberite
Kleberite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Fe³⁺Ti₆O₁₁(OH)₅.
It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Tivanite structural group.
Key properties: specific gravity 3.28; Beige streak; Waxy to vitreous luster; optically uniaxial.
IMA symbol Kbr, IMA status: approved, named in 2012.
Found in the heavy mineral fractions of marine sand deposits.
It is found associated with MgO-rich ferrian ilmenite, pseudorutile, “leucoxene, ” tourmaline, spinel, kaolinite, quartz, diaspore.
The mineral was named to honor Will Kleber (1906-1970), a former director of the Institute of Mineralogy and the Museum of Mineralogy, Humboldt University, Berlin, Germany.