Ferroalluaudite Mineral Data

Ferroalluaudite Mineral Data

General Ferroalluaudite Information

Chemical Formula:

NaCaFe++(Fe++,Mn,Fe+++,Mg)2(PO4)3

Composition:

Molecular Weight = 474.99 gm

Sodium 5.32 % Na 7.18 % Na₂O

Calcium 0.84 % Ca 1.18 % CaO

Magnesium 1.02 % Mg 1.70 % MgO

Manganese 5.78 % Mn 7.47 % MnO

Iron 27.04 % Fe 9.08 % FeO / 28.58 % Fe₂O₃

Phosphorus 19.56 % P 44.83 % P₂O₅

Oxygen 40.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_1.1Ca_0.1Fe²⁺_0.6Mn²⁺_0.5Fe³⁺_1.7Mg_0.2(PO₄)₃

Environment:

Zoned granitic pegmatites in phosphate nodules.

IMA Status:

Approved IMA 1979

Locality:

Pleasant Valley Pegmatite and the Helen Beryl mine, near Custer, Custer County, South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

For dominant ferrous iron content and relationship to alluaudite.

Synonym:

Ferro-alluaudite

IMA1987-046a

Ferroalluaudite Image

Images:

Ferroalluaudite

Comments: Dark green crystalline ferro alluaudite in pegmatite.
Location: Chandler Mills Mine, Newport, Sullivan County, New Hampshire, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferroalluaudite Crystallography

Axial Ratios:

a:b:c =0.869:1:0.513

Cell Dimensions:

a = 10.898, b = 12.54, c = 6.434, Z = 4; beta = 114.6° V = 799.47 Den(Calc)= 3.95

Crystal System:

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

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

By Intensity(I/I_o): 2.703(1), 6.24(0.7), 3.085(0.55),

Physical Properties of Ferroalluaudite

Color:

Blue green.

Diaphaniety:

Semitransparent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Optical Properties of Ferroalluaudite

Optical Data:

Biaxial (+), a=1.727, g=1.738, bire=0.0110

Pleochroism (x):

dull green or pale blue.

Pleochroism (y):

bright blue-tinged green.

Pleochroism (z):

bright blue-tinged green.

Calculated Properties of Ferroalluaudite

Electron Density:

r_electron=3.82 gm/cc
note: r_{Ferroalluaudite}=3.95 gm/cc.

Fermion Index

Fermion Index = 0.00696
Boson Index = 0.99304

Photoelectric:

PE_{Ferroalluaudite}= 10.77 barns/electron
U=PE_{Ferroalluaudite} x r_electron= 41.15 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferroalluaudite is Not Radioactive

Ferroalluaudite Classification

Dana Class:

38.2.3.5 (38)Anhydrous Phosphates, etc

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

(38.2.3)Alluaudite-Wyllieite Group (Alluaudite Subgroup)

38.2.3.1 Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 2₁/a 2/m

38.2.3.2 Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 2₁/a 2/m

38.2.3.3 Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m

38.2.3.4 Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 2₁/a 2/m

38.2.3.5 Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m

38.2.3.6 Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m

38.2.3.7 Odanielite Na(Zn,Mg)3H2(AsO4)3 C 2/c 2/m

38.2.3.8 Johillerite Na(Mg,Zn)3Cu(AsO4)3 I2/c 2/m

38.2.3.9 Nickenichite Na0,8Ca0,4(Mg,Fe,Al)3Cu0,4(AsO4)3 C 2/c 2/m

38.2.3.10 Yazganite! NaFe2(Mg,Mn)(AsO4)3·H2O C 2/c 2/m

Strunz Class:

VII/A.06-60 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 Ferroalluaudite Information

References:

NAME( Dana8) PHYS. PROP.(AntBidBlaNic4) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Ferroalluaudite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 -École des Mines de Paris

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Ferroalluaudite

NaCaFe++(Fe++,Mn,Fe+++,Mg)2(PO4)3
Dana No: 38.2.3.5 Strunz No: VII/A.06-60
Locality:

Notes: