Ferrowyllieite Mineral Data

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.

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),

Physical Properties of Ferrowyllieite

Cleavage:

[010] Perfect, [101] Distinct

Color:

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

Density:

3.6

Diaphaniety:

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

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:

r_electron=3.63 gm/cc
note: r_{Ferrowyllieite}=3.74 gm/cc.

Fermion Index

Fermion Index = 0.00622
Boson Index = 0.99378

Photoelectric:

PE_{Ferrowyllieite}= 9.34 barns/electron
U=PE_{Ferrowyllieite} x r_electron= 33.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrowyllieite is Not Radioactive

Ferrowyllieite Classification

Dana Class:

38.2.4.1 (38)Anhydrous Phosphates, etc

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

(38.2.4)Alluaudite-Wyllieite Group (Wyllieite Subgroup)

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

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

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

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

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

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

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

Strunz Class:

VII/A.06-30 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.06 - Alluaudite- Hagendorfite group

VII/A.06-10 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 2₁/n 2/m

VII/A.06-20 Bobfergusonite Na2Mn5FeAl(PO4)6 P 2₁/n 2/m

VII/A.06-30 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

VII/A.06-40 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

VII/A.06-50 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 2₁/n 2/m

VII/A.06-60 Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m

VII/A.06-70 Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m

VII/A.06-80 Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 2₁/a 2/m

VII/A.06-85 Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 2₁/a 2/m

VII/A.06-90 Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 2₁/a 2/m

VII/A.06-100 Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m

VII/A.06-110 Arseniopleite (Ca,Na)(Na,Pb)Mn(Mn,Mg,Fe)2(AsO4)3 I2/a 2/m

VII/A.06-120 Caryinite (Na,Pb)(Ca,Na)(Ca,Mn)(Mn,Mg)2(AsO4)3 I2/c 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Ferrowyllieite

(Na,Ca,Mn)(Fe++,Mn)(Fe++,Fe+++,Mg)Al(PO4)3
Dana No: 38.2.4.1 Strunz No: VII/A.06-30
Locality:

Notes: