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 - Renamed Ferroalluaudite by Mineralogical Record, v39 (2008), p131

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 - Prismatic H-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.

Diaphaneity:

Semitransparent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Optical Properties of Ferroalluaudite

Gladstone-Dale:

CI calc= 0.17 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1854,KC= 0.2233
Ncalc = 1.88

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:

Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Ferroalluaudite =3.95 gm/cc.

Fermion Index:

Fermion Index = 0.0069617791
Boson Index = 0.9930382209

Photoelectric:

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

Radioactivity:

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

Ferroalluaudite Classification

Dana Class:

38.02.03.05 (38)Anhydrous Phosphates, etc

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

(38.02.03)Alluaudite-Wyllieite Group (Alluaudite Subgroup)

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

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

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

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

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

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

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

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

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

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

38.02.03.11 IMA2008-054! NaCaMn2(PO4)[PO3(OH)]2 C 2/c 2/m

38.02.03.12 IMA2008-064! Na16Mn25Al8(PO4)30 Pc m

Strunz Class:

08.AC.10 08 - PHOSPHATES, ARSENATES, VANADATES

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

08.AC -With medium-sized and large cations

08.AC.10 Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m

08.AC.10 Arseniopleite (Ca,Na)(Na,Pb)Mn(Mn,Mg,Fe)2(AsO4)3 I2/a 2/m

08.AC.10 Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 2₁/a 2/m

08.AC.10 Caryinite (Na,Pb)(Ca,Na)(Ca,Mn)(Mn,Mg)2(AsO4)3 I2/c 2/m

08.AC.10 Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 2₁/a 2/m

08.AC.10 Johillerite Na(Mg,Zn)3Cu(AsO4)3 I2/c 2/m

08.AC.10 Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m

08.AC.10 Odanielite Na(Zn,Mg)3H2(AsO4)3 C 2/c 2/m

08.AC.10 Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 2₁/a 2/m

08.AC.10 Nickenichite Na0,8Ca0,4(Mg,Fe,Al)3Cu0,4(AsO4)3 C 2/c 2/m

08.AC.10 Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m

08.AC.10 Bradaczekite! NaCu4(AsO4)3 C 2/c 2/m

08.AC.10 Yazganite! NaFe2(Mg,Mn)(AsO4)3•H2O C 2/c 2/m

08.AC.10 IMA2008-054! NaCaMn2(PO4)[PO3(OH)]2 C 2/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 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Ferroalluaudite

NaCaFe++(Fe++,Mn,Fe+++,Mg)2(PO4)3
Dana No: 38.02.03.05 Strunz No: 08.AC.10
Locality:

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