Wyllieite Mineral Data

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General Wyllieite Information

Chemical Formula:

(Na,Ca,Mn++)(Mn++,Fe++)(Fe++,Fe+++,Mg)Al(PO4)3

Composition:

Molecular Weight = 451.11 gm

Sodium 3.06 % Na 4.12 % Na₂O

Calcium 2.67 % Ca 3.73 % CaO

Magnesium 0.54 % Mg 0.89 % MgO

Manganese 9.74 % Mn 12.58 % MnO

Aluminum 5.98 % Al 11.30 % Al₂O₃

Iron 14.86 % Fe 14.33 % FeO / 5.31 % Fe₂O₃

Phosphorus 20.60 % P 47.20 % P₂O₅

Oxygen 42.56 % O

______ ______

100.00 % 99.47 % = TOTAL OXIDE

Empirical Formula:

Na_0.6Ca_0.3Mn²⁺_0.8Fe²⁺_0.9Fe³⁺_0.3Mg_0.1Al(PO₄)₃

Environment:

In zoned complex granite pegmatite.

IMA Status:

Approved IMA 1973

Locality:

Old Mike mine, 6 km north-northwest for Custer, Custer County, South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Peter John Wyllie (1930-), Professor of Petrology and Geochemistry, University of Chicago, Chicago, Illinois, USA.

Name Pronunciation:

Wyllieite + Pronunciation

Synonym:

ICSD 6203

PDF 39-409

Wyllieite Image

Images:

Wyllieite

Comments: Dark bluish-black massive wyllieite in pegmatite.
Location: Victory Mine, Custer, Custer County, South Dakota, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Wyllieite Crystallography

Axial Ratios:

a:b:c =0.9584:1:0.5131

Cell Dimensions:

a = 11.868, b = 12.382, c = 6.354, Z = 4; beta = 114.52° V = 849.51 Den(Calc)= 3.53

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 2.674(1), 2.693(1), 6.15(0.6),

Crystal Structure:

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Moore P B , Molin-Case J , American Mineralogist , 59 (1974) p.280-290, Contribution to pegmatite phosphate giant crystal paragenesis: II. The crystal, chemistry of wyllieite, Na2Fe2Al[PO4]3, a primary phase

Physical Properties of Wyllieite

Cleavage:

None

Color:

Bluish green, Greenish black, Gray green, Dark green.

Density:

3.601

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Metallic

Streak:

olive green

Optical Properties of Wyllieite

Gladstone-Dale:

CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1959,KPDmeas= 0.1921,KC= 0.1957
Ncalc = 1.69 - 1.7

Optical Data:

Biaxial (+), a=1.688, b=1.691, g=1.696, bire=0.0080, 2V(Calc)=76, 2V(Meas)=50.

Calculated Properties of Wyllieite

Electron Density:

Bulk Density (Electron Density)=3.43 gm/cc
note: Specific Gravity of Wyllieite =3.53 gm/cc.

Fermion Index:

Fermion Index = 0.0039284984
Boson Index = 0.9960715016

Photoelectric:

PE_Wyllieite= 8.49 barns/electron
U=PE_Wyllieite x rElectron Density= 29.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wyllieite is Not Radioactive

Wyllieite Classification

Dana Class:

38.02.04.02 (38)Anhydrous Phosphates, etc

(38.02)(A+ B++)5 (XO4)3

(38.02.04)Alluaudite-Wyllieite Group (Wyllieite Subgroup)

38.02.04.01 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.02.04.02 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.02.04.03 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

38.02.04.04 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 2₁/n 2/m

38.02.04.05 Bobfergusonite Na2Mn5FeAl(PO4)6 P 2₁/n 2/m

38.02.04.06 Bradaczekite! NaCu4(AsO4)3 C 2/c 2/m

38.02.04.07 Ferrorosemaryite! []NaFeFeAl(PO4)3 P 2₁/n 2/m

Strunz Class:

08.AC.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.15 Bobfergusonite Na2Mn5FeAl(PO4)6 P 2₁/n 2/m

08.AC.15 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

08.AC.15 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 2₁/n 2/m

08.AC.15 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

08.AC.15 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

08.AC.15 Ferrorosemaryite! []NaFeFeAl(PO4)3 P 2₁/n 2/m

Other Wyllieite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Wyllieite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Wyllieite

(Na,Ca,Mn++)(Mn++,Fe++)(Fe++,Fe+++,Mg)Al(PO4)3
Dana No: 38.02.04.02 Strunz No: 08.AC.15
Locality:

Notes: