Pretulite Mineral Data

Pretulite Mineral Data +

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General Pretulite Information

Chemical Formula:

ScPO4

Composition:

Molecular Weight = 139.93 gm

Scandium 32.13 % Sc 49.28 % Sc₂O₃

Phosphorus 22.14 % P 50.72 % P₂O₅

Oxygen 45.74 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sc(PO₄)

Environment:

In lazulite-quartz veins in phyllite-micaschist. The scandium dominant analog of xenotime-(Y).

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

The type locality is 100 m southwest of Hollkegel, which is 12 km south-southwest of Murzzuschlag, Fischbacher Alpen, Styria, Austria. Link to MinDat.org Location Data.

Name Origin:

For the mountain Pretul, one of the localities at which the mineral occurs.

Synonym:

ICSD 85552

IMA1996-024

PDF 48-477

Pretulite Image

Images:

Pretulite

Comments: SEM-BSE image of a euhedral crystal of pretulite (left), and proposed crystal forms (right).
Location: Apatite-rich oolitic Ordovician ironstone at Saint-Aubin-des-Ch?teaux, Armorican Massif, France. Scale: See Picture.
© Canadian Mineralogist

Pretulite 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 DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.293(1), 1.6927(0.45), 2.4636(0.42),

Forms:

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Forms: [ 2 1 1] [ 1 0 0]

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Crystal Structure:

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Bernhard F , Walter F , Ettinger K , Taucher J , Mereiter K , American Mineralogist , 83 (1998) p.625-630, Pretulite, ScPO4, a new scandium mineral from the Styrian and Lower Austrian, lazulite occurrences, Austria

View Additional jPOWD Structure files for Pretulite
[1]

Physical Properties of Pretulite

Cleavage:

[100] Perfect

Color:

Pale pink.

Density:

3.71

Diaphaniety:

Transparent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

5 - Apatite

Luster:

Adamantine

Streak:

white

Optical Properties of Pretulite

Gladstone-Dale:

CI meas= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2126,KPDmeas= 0.2115,KC= 0.2195

Optical Data:

Uniaxial (+), w=1.709, e=1.86, bire=0.1510.

Calculated Properties of Pretulite

Electron Density:

r_electron=3.59 gm/cc
note: r_Pretulite=3.69 gm/cc.

Fermion Index

Fermion Index = 0.00021
Boson Index = 0.99979

Photoelectric:

PE_Pretulite= 5.60 barns/electron
U=PE_Pretulite x r_electron= 20.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pretulite is Not Radioactive

Pretulite Classification

Dana Class:

38.4.11.5 (38)Anhydrous Phosphates, etc

(38.4)A+ XO4

(38.4.11)Zenotime Group (Tetragonal: I41/amd)

38.4.11.1 Xenotime-(Y) YPO4 I 4₁/amd 4/m 2/m 2/m

38.4.11.2 Chernovite-(Y) YAsO4 I 4₁/amd 4/m 2/m 2/m

38.4.11.3 Wakefieldite-(Y) YVO4 I 4₁/amd 4/m 2/m 2/m

38.4.11.4 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 4₁/amd 4/m 2/m 2/m

38.4.11.5 Pretulite ! ScPO4 I 4₁/amd 4/m 2/m 2/m

38.4.11.6 Xenotime-(Yb)! YbPO4 I 4₁/amd 4/m 2/m 2/m

Strunz Class:

VII/A.14-05 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and andre

VII/A.14 - Xenotime-(Y) - Wakefieldite-(Ce) series

VII/A.14-05 Pretulite ScPO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-08 Xenotime-(Yb)! YbPO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-10 Xenotime-(Y) YPO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-20 Chernovite-(Y) YAsO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-25 Chernovite-(Ce)* (Ce,Y)(AsO4) I 4₁/amd 4/m 2/m 2/m

VII/A.14-30 Wakefieldite-(Y) YVO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-40 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 4₁/amd 4/m 2/m 2/m

Other Pretulite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p625-630,1998) OPTIC PROP.(Am.Min.,Vol.83,p625-630,1998)

See Also:

Links to other databases for Pretulite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST

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Pretulite

ScPO4
Dana No: 38.4.11.5 Strunz No: VII/A.14-05
Locality:

Notes: