Wolfeite Mineral Data

Wolfeite Mineral Data +

General Wolfeite Information

Chemical Formula:

(Fe++,Mn++)2(PO4)(OH)

Composition:

Molecular Weight = 223.22 gm

Manganese 12.31 % Mn 15.89 % MnO

Iron 37.53 % Fe 48.28 % FeO

Phosphorus 13.88 % P 31.80 % P₂O₅

Hydrogen 0.45 % H 4.04 % H₂O

Oxygen 35.84 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_1.5Mn²⁺_0.5(PO₄)(OH)

Environment:

Alteration product of triphylite.

IMA Status:

Valid Species (Pre-IMA) 1949

Locality:

Palermo mine, North Groton, New Hampshire. Link to MinDat.org Location Data.

Name Origin:

Named for Caleb Wroe Wolfe (1908-1980), crystallographer, Boston University.

Wolfeite Image

Images:

Wolfeite

Comments: Opaque massive wolfeite.
Location: Wilson's Pegmatite, Broken Hill, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Wolfeite Wicksite

Comments: Cleaved nodule of fine-grained aggregate of wicksite and wolfeite.
Location: Big Fish River, Yukon, Canada. Scale: 3 x 1.5 cm.
© Dave Barthelmy

Wolfeite Crystallography

Axial Ratios:

a:b:c =0.9263:1:0.7433

Cell Dimensions:

a = 12.2, b = 13.17, c = 9.79, Z = 16; beta = 108° V = 1,496.01 Den(Calc)= 3.96

Crystal System:

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

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

By Intensity(I/I_o): 2.93(1), 3.09(0.9), 3.18(0.8),

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Crystal Structure:

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Kolitsch U , Acta Crystallographica, Section E , 59 (2003) p.i125-i128, Mg-rich wolfeite, (Fe,Mg)2(PO4)(OH): structure refinement and, Raman spectroscopic data, Locality: Big Fish River area, Yukon Territory, Canada

Physical Properties of Wolfeite

Cleavage:

[010] Good, [120] Distinct

Color:

Greenish, Dark brown, Reddish brown.

Density:

3.79

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

4.5-5 - Near Apatite

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Wolfeite

Gladstone-Dale:

CI meas= -0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1913,KPDmeas= 0.1999,KC= 0.194

Optical Data:

Biaxial (+), a=1.741, b=1.742, g=1.79, bire=0.0490

Calculated Properties of Wolfeite

Electron Density:

r_electron=3.81 gm/cc
note: r_Wolfeite=3.96 gm/cc.

Fermion Index

Fermion Index = 0.00812
Boson Index = 0.99188

Photoelectric:

PE_Wolfeite= 15.16 barns/electron
U=PE_Wolfeite x r_electron= 57.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wolfeite is Not Radioactive

Wolfeite Classification

Dana Class:

41.6.3.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.6)where (A)2 (XO4) Zq

(41.6.3)Dana Group

41.6.3.1 Wolfeite (Fe,Mn)2(PO4)(OH) P 2₁/a 2/m

41.6.3.2 Triploidite (Mn,Fe)2(PO4)(OH) P 2₁/a 2/m

41.6.3.3 Sarkinite Mn2(AsO4)(OH) P 2₁/a 2/m

41.6.3.4 Stanekite! Fe(Mn,Fe,Mg)(PO4)O P 2₁/a 2/m

41.6.3.5 IMA2004-009! Mg2(PO4)(OH) P 2₁/c 2/m

Strunz Class:

VII/B.03-50 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.03 - Wagnerite - Sarkinite series

VII/B.03-10 Wagnerite (Mg,Fe)2(PO4)F P 2₁/a 2/m

VII/B.03-20 Magniotriplite? (Mg,Fe,Mn)2(PO4)F P 2₁/a 2/m

VII/B.03-30 Zwieselite (Fe,Mn)2(PO4)F I2/a 2/m

VII/B.03-40 Triplite (Mn,Fe,Mg,Ca)2(PO4)(F,OH) I2/m 2/m

VII/B.03-50 Wolfeite (Fe,Mn)2(PO4)(OH) P 2₁/a 2/m

VII/B.03-60 Triploidite (Mn,Fe)2(PO4)(OH) P 2₁/a 2/m

VII/B.03-65 Stanekite! Fe(Mn,Fe,Mg)(PO4)O P 2₁/a 2/m

VII/B.03-70 Sarkinite Mn2(AsO4)(OH) P 2₁/a 2/m

Other Wolfeite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Wolfeite

(Fe++,Mn++)2(PO4)(OH)
Dana No: 41.6.3.1 Strunz No: VII/B.03-50
Locality:

Notes: