Pretulite Mineral Data

General Information

Chemical Formula: ScPO4
Composition: Molecular Weight = 139.93 gm)
 
  Oxygen 45.74 % O
 
  Phosphorus 22.14 % P
 
  Scandium 32.13 % Sc
Environment: In lazulite-quartz veins in phyllite-micaschist. The scandium dominant analog of xenotime-(Y).
IMA Status: Approved IMA (Dana # Added)
Locality: The type locality is 100 m southwest of Hollkegel, which is 12 km south-southwest of Murzzuschlag, Fischbacher Alpen, Styria, Austria.
Name Origin: For the mountian Pretul, one of the localities at which the mineral occurs.
Synonym: IMA96.024
 

Classification

Dana Class: 38.4.11.5 (38)Anhydrous Phosphates, etc (38.4)A+ XO4 (38.4.11)Zenotime Group (Tetragonal: I41/amd)
 

Crystallography

Axial Ratios: a:c = 1:0.88116
Cell Dimensions: a = 6.589, c = 5.806, Z = 4; V = 252.07 Den(Calc)= 3.69
Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I41/amd
X Ray Diffraction: By Intensity(I/Io): 3.293(1) 1.6927(0.45) 2.4636(0.42)
 

Physical Properties

Cleavage: [100] Perfect
Color: pale pink.
Density: 3.71
Diaphaniety: Transparent
Habits: Crystalline - Fine - Occurs as well-formed fine sized crystals., ,
Hardness: 5 - Apatite
Luster: Adamantine
Streak: white
 

Optical Properties

Dichroism (e): none.
Dichroism (w): none.
Optical Data: Uniaxial (+), w=1.709, e=1.86, bire=0.1510.
 

Other Information

References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p625-630,1998) OPTIC PROP.(Am.Min.,Vol.83,p625-630,1998)
See Also: Frederic Biret
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