Muséum national d'histoire naturelle _ The species

FROM : Mine of Dieresis, Hornachuelos, Cordoba, Spain
SIZE : 10 x 7.5 x 5.2 cm

This sample of brannerite is rather impressive by its dimensions: 10x 7.5 x 5.2 cm. This brannerite has a white-grayish color, with a greasy lustre.

It was discovered in the deposit of Dieresis in the province of Cordoba in Spain. This specimen was acquired thanks to support from Total. This sample is kept today in the storage rooms of the collections of the Muséum national d'Histoire naturelle (i.e., not yet displayed to the public).

Photography: Louis-Dominique Bayle, © MNHN.

SPECIE : Brannerite

HISTORY : Species dedicated to Dr. John Casper Branner (1850-1922), American geologist, former president of the Stanford University

Species first described in 1920 by FL Hess & RC Wells

Type-locality: Kelly Gulch, Custer County, Idaho, USA

CHEMICAL FORMULA : (U,Ca) (Ti,Fe)2 O6
CRYSTAL SYSTEM : Monoclinic
COLOR : Black, brown, yellow-brown
DIAPHANIETY : Opaque
LUSTER : Vitreous to resineous
STREAK : Dark greenish
MORPHOLOGY : Undistinctive, prismatic crystals, rounded grains
HARDNESS : 4,5-5,5
DENSITY : 5,2

CHEMICAL CLASS : IV - Oxides and hydroxide
GROUP : Brannerite
STRUNZ CLASS BEFORE 2001 : 4/D.22-20
STRUNZ CLASS AFTER 2001 : 4.DH.05

Explore the Mineral Treasures of the Muséum

Welcome to
the Virtual Gallery of Mineralogy

Brannerite

Brannerite

MNHN N°203.232

general description

The Species page

Mineralogy