Ferrowyllieite Mineral Data

General Ferrowyllieite Information

Chemical Formula:

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

Composition:

Molecular Weight = 478.55 gm

Sodium 6.25 % Na 8.42 % Na₂O

Calcium 1.67 % Ca 2.34 % CaO

Magnesium 1.02 % Mg 1.68 % MgO

Manganese 3.44 % Mn 4.45 % MnO

Aluminum 4.51 % Al 8.52 % Al₂O₃

Iron 23.57 % Fe 30.03 % FeO / 0.33 % Fe₂O₃

Phosphorus 19.42 % P 44.49 % P₂O₅

Oxygen 40.12 % O

______ ______

100.00 % 100.27 % = TOTAL OXIDE

Empirical Formula:

Na_1.3Mn²⁺_0.3Ca_0.2Fe²⁺₂Al_0.8Mg_0.2Fe³⁺_0.02(PO₄)₃

Environment:

Primary phosphate in zoned granite pegmatites. Forms a series with wyllieite and with rosemaryite.

IMA Status:

Approved IMA 1979

Locality:

Victory mine, 4 km northeast of Custer, Custer County, South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

Dominant ferrous iron and relationship to wyllieite.

Name Pronunciation:

Ferrowyllieite + Pronunciation

Ferrowyllieite Image

Images:

Ferrowyllieite

Comments: Deep greenish black massive ferrowyllieite with brown to white quartz.
Location: Victory Mine, near Custer, Custer County, South Dakota, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferrowyllieite 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)= 3.74

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 Ferrowyllieite

Cleavage:

{010} Perfect, {101} Distinct

Color:

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

Density:

3.6

Diaphaneity:

Transparent to Translucent

Fracture:

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

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Selvage - As a reaction rim, surrounding the host mineral.

Hardness:

4 - Fluorite

Luster:

Vitreous - Metallic

Streak:

gray green

Optical Properties of Ferrowyllieite

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1849,KPDmeas= 0.1921,KC= 0.1896
Ncalc = 1.68 - 1.71

Optical Data:

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

Pleochroism (x):

smoky bluish gray.

Pleochroism (y):

smoky bluish green.

Pleochroism (z):

green.

Calculated Properties of Ferrowyllieite

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Ferrowyllieite =3.60 gm/cc.

Fermion Index:

Fermion Index = 0.0062284789
Boson Index = 0.9937715211

Photoelectric:

PE_{Ferrowyllieite}= 9.34 barns/electron
U=PE_{Ferrowyllieite} x rElectron Density= 32.61 barns/cc.

Radioactivity:

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

Ferrowyllieite Classification

Dana Class:

38.02.04.01 (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 Ferrowyllieite Information

References:

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

See Also:

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

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Print or Cut-and-Paste your Ferrowyllieite Specimen Label here :

Ferrowyllieite

(Na,Ca,Mn)(Fe++,Mn)(Fe++,Fe+++,Mg)Al(PO4)3
Dana No: 38.02.04.01 Strunz No: 08.AC.15
Locality:

Notes: