Protasite	IMA-A 1984-001
Uranium	5.5.3.1 (Dana Classification Number)
(No Images)	4/H.03-30 (Strunz ID)

Property	Data	Remarks
Named for:	Jean Protas, Professor at the University of Nancy, France, who contributed much to the mineralogy of the hydrated oxides of Uranium.
Alternate     Name(s):
Mineral Class:	Oxides   Uranyl ([UO2]2+) hydroxides and hydrates     Compreignacite - Billietite series
Chemical     Formula:	Ba(UO2)3O3(OH)2 · 3H2O
Chemical     Composition:	Barium: (Ba) 12.67% Hydrogen: (H) 0.74% Oxygen: (O) 20.67% Uranium: (U) 65.91%	by weight
Molecular     Weight:	1,083.47	daltons (amu)
Specific     Radioactivity:	(All radiation is for a 1 gram, fully aged specimen) Specific Activity Dose Rate Becquerels Curies milliRems/hour microSieverts/hour 1.17974 × 1005 3.19 × 10-06 1.54 154.10 Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
Crystalography:	System: Monoclinic - Domatic Axial Ratios: a: 1.7027 b: 1 c: 0.9633 Cell Dimensions: a: 12.2949 Å b: 7.2206 Å c: 6.9558 Å Z: 2 b: 90.401° V: 617.50 Å3 DenCalc: 5.83 H-M Symbol: m Space Group: Pn X-Ray Diffraction:   By Intensity ( I/Io ) (1): 3.14 Å (0.5): 7.06 Å (0.35): 3.58 Å
Habit:	Pseudo hexagonal Micaceous on {010} plane
Cleavage:	[001]   [010] Good [100]
Fracture:
Moh's     Hardness:
Density:	5.827	grams/cm3
Color:	Light orange
Streak:
Luster:	Subadamantine
Diaphaneity:	Transparent
Pleochroism:	(x):   (y:)   (z:)
Ultra Violet     Fluorescence:	Long Wave:   Short Wave:
Magnetism:	Non-magnetic
Occurance:
Associated     Minerals:	Barite, Becquerelite, Billietite, Ianthinite, Kasolite, Metatorbernite, Schoepite, Studtite, Torbernite, Uraninite, Uranophane, Vaesite, Zippeite Mineral   -   both sites Minerals   -   Uranium & Thorium mineral links	These are minerals known to be found with Protasite
Locations:	Extremely rare Protasite Locations
Notes:	Strongly radioactive a- and b-particles, g-rays. Crystals are probably metamic.