Brannerite	IMA-GP
Uranium	8.3.4.1 (Dana Classification Number)
(No Images)	4/D.22-20 (Strunz ID)

Property	Data	Remarks
Named for:	G. Branner (1850-1922), geologist
Alternate     Name(s):	(Also see Absite, a high Thorium content form of Brannerite)
Mineral Class:	Oxides   Oxides with metal: (metal:oxygen = 1:2 - MO2 and related compounds)     Thorutite - Orthobrannerite series
Chemical     Formula:	(U,Ca,Ce)(Ti,Fe)2O6
Chemical     Composition:	Calcium: (Ca) 3.39% Cerium: (Ce) 7.90% Iron: (Fe) 7.87% Oxygen: (O) 27.06% Titanium: (Ti) 20.24% Uranium: (U) 33.54%	by weight
Molecular     Weight:	354.80	daltons (amu)
Specific     Radioactivity:	(All radiation is for a 1 gram, fully aged specimen) Specific Activity Dose Rate Becquerels Curies milliRADs per hour microSieverts 6.0221 × 1004 1.63 × 10-06 0.84 8.38 Estimated Average Annual Exposure: 3.6 RAD (3.6 centiSieverts)
Crystalography:	System: Monoclinic - Prismatic Axial Ratios: a: 2.3421 b: 1 c: 1.8394 Cell Dimensions: a: 8.9 Å b: 3.8 Å c: 6.99 Å Z: 2 b: 104.75° V: 228.61 Å3 DenCalc: 5.15 H-M Symbol: 2/m Space Group: C2/m X-Ray Diffraction:   By Intensity ( I/Io ) (1): 3.42 Å (0.8): 1.903 Å (0.7): 2.455 Å
Habit:	Prismatic Crystalline - (fine) Metamict
Cleavage:	None
Fracture:	Uneven
Moh's     Hardness:	4 - 5
Density:	4.5 - 5.42 - 6.35	grams/cm3
Color:	Brown, Brown green, Yellow, Yellow brown, or Black
Streak:	Dark greenish brown to Dark brown
Luster:	Adamantine - Resinous
Diaphaneity:	Subtranslucent to Opaque
Pleochroism:	(x):   (y:)   (z:)
Ultra Violet     Fluorescence:	Long Wave:   Short Wave:
Magnetism:	Non-magnetic
Occurance:	Found in gold placers
Associated     Minerals:	Albite, Arsenopyrite, Barite, Chalcopyrite, Fluorite, Galena, Gold, Hematite, Malachite, Pyrite, Quartz, Uraninite Mineral   -   > 65% of sites Mineral   -   > 50% of sites Mineral   -   > 25% of sites Minerals   -   Uranium & Thorium mineral links	These are minerals known to be found with Brannerite
Localities:	Somewhat rare Brannerite Localities
Notes:	Strongly radioactive a- and b-particles, g-rays. Forms a series with Thorutite. Crystals are probably metamic. High Thorium content (12.7%) Brannerite is refered to as Absite.