Sabugalite	IMA-GP
Uranium	40.2a.24.1 (Dana Classification Number)
(Images)	7/E.01-20 (Strunz ID)

Property	Data	Remarks
Named for:	Sabugal, Beira Baixa Province, Vila Real District, Portugal, its type locality
Alternate     Name(s):	Aluminium-Autunite
Mineral Class:	Phosphates, Arsenates and Vanadates   Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-     Autunite group
Chemical     Formula:	HAl(UO2)4(PO4)4 · 16H2O or: (AlH)0.5[(UO2) | (PO4)]2 · 8H2O      †
Chemical     Composition:	Aluminum: (Al) 1.52% Hydrogen: (H) 1.87% Oxygen: (O) 36.03% Phosphorus: (P) 6.98% Uranium: (U) 53.60%	by weight
Molecular     Weight:	1,776.23	daltons (amu)
Specific     Radioactivity:	(All radiation is for a 1 gram, fully aged specimen) Specific Activity Dose Rate Becquerels Curies milliRems/hour microSieverts/hour 9.5950 × 1004 2.59 × 10-06 1.34 134.30 Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
Crystalography:	System:   Tetragonal - Ditetragonal Dipyramidal Monoclinic      †  Axial Ratios: a: 1 1.97459      †  b:   1      †  c: 2.77298 1.0010      †  Cell Dimensions: a: 6.96 Å 19.43 Å      †  b:   9.84 Å      †  c: 19.3 Å 9.85 Å      †  Z: 1 4      †  b:   96.167°      †  V: 934.92 Å3   DenCalc: 3.15   H-M Symbol:   4/m 2/m 2/m   Space Group:   I4/mmm C2/m      †  X-Ray Diffraction:   By Intensity ( I/Io ) (1): 9.69 Å 3.73 Å      †   ‡  (0.9): 4.86 Å 3.47 Å      †   ‡  (0.8): 3.47 Å 4.90 Å      †   ‡  (0.7):   3.36 Å      †   ‡	Sabugalite Crystal (As Observed - Monoclinic)
Habit:	Square, flat plates Agregate crusts      †
Cleavage:	[001] Perfect [010]   [100]
Fracture:
Moh's     Hardness:	2.5
Density:	3.2	grams/cm3
Color:	Light Yellow
Streak:	Yellow white
Luster:	Vitreous
Diaphaneity:	Transparent to Translucent
Pleochroism:	(x): Colorless (y:) Colorless (z:) Colorless
Ultra Violet     Fluorescence:	Long Wave: Intense Lemon Yellow      †  Short Wave: Intense Lemon Yellow      †
Magnetism:	Non-magnetic
Occurance:	Uranium bearing sandstones of the Colorado Plateau
Associated     Minerals:	Arsenopyrite, Autunite, Barite, Bassetite, Chalcopyrite, Chernikovite, Coffinite, Dewindtite, Galena, 'Gummite', Hematite, Meta-Autunite, Metatorbernite, Phosphuranylite, Pitchblende, Pyrite, Quartz, Saléeite, Torbernite, Uraninite, Uranocircite, Uranophane Mineral   -   > 50% of sites Mineral   -   > 35% of sites Mineral   -   > 20% of sites Minerals   -   Uranium & Thorium mineral links	These are minerals known to be found with Sabugalite
Locations:	Somewhat rare Sabugalite Locations
Notes:	Strongly radioactive a- and b-particles, g-rays. A Potassium-rich variety also exists.  †  Crystals are probably metamict.  †  J.H. Bernard and J. Hyrsl, Minerals and their Localities.  ‡  Synthetic mineral used.

Sabugalite Images

Specimen Top
	(001aa)	(001ab)
(001a)	(001b)	(001c)	(001d)
	(001e)	(001f)
Sabugal County, Beira Alta Province, Portugal
Specimen Notes Occurrence - The Sabugalite occurs on a partially metamorphosed high density sandstone. Images (001aa) and (001ab) were 'taken' using a flatbed scanner. The specimen is roughly shaped like a triangular prism. Crystals - The crystals are flat plates, most showing non-90° corners. This non-square form has to be carefully looked for in the images, best done using a reference square. This lends credibility to the Monoclinic form given by Bernard and Hyrsl.   †    Appearence - The crystals show striations parallel to the (010) and (100) axes. Striations also occur along the (110) axes, and on some crystals, these are the predominate directions, as best seen in image (001d). It is suspected that on these crystals, the axes of the striations are (010) and (100), and the crystal edges are (110). These crystals are also fragmentary. Diaphaniety - The crystals varry from subtransparent to translucent. Luster - The main pinacoid is viteous in luster. The crystals are too thin ti accurately determine the luster of the edges.     -     Specimen Physical Properties Size   cm   cm   cm Weight: x grams     g-Radiation Level:   cmp   msieverts background: 20 cpm