General Ferroalluaudite Information
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Chemical Formula: |
NaCaFe++(Fe++,Mn,Fe+++,Mg)2(PO4)3 |
Composition: |
Molecular Weight = 474.99 gm |
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Sodium 5.32 % Na 7.18 % Na2O |
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Calcium 0.84 % Ca 1.18 % CaO |
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Magnesium 1.02 % Mg 1.70 % MgO |
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Manganese 5.78 % Mn 7.47 % MnO |
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Iron 27.04 % Fe 9.08 % FeO / 28.58 % Fe2O3 |
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Phosphorus 19.56 % P 44.83 % P2O5 |
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Oxygen 40.42 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Na1.1Ca0.1Fe2+0.6Mn2+0.5Fe3+1.7Mg0.2(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 |
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IMA1987-046a |
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Ferroalluaudite Image |
Images:
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Ferroalluaudite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 2.703(1), 6.24(0.7), 3.085(0.55), |
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Physical Properties of Ferroalluaudite
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Color: |
Blue green. |
Diaphaniety: |
Semitransparent |
Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
Hardness: |
5 - Apatite |
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Optical Properties of Ferroalluaudite
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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. |
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Calculated Properties of Ferroalluaudite
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Electron Density: |
relectron=3.82 gm/cc note: rFerroalluaudite =3.95 gm/cc. |
Fermion Index |
Fermion Index = 0.00696 Boson Index = 0.99304 |
Photoelectric: |
PEFerroalluaudite = 10.77 barns/electron U=PEFerroalluaudite x relectron= 41.15 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ferroalluaudite is Not Radioactive |
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Ferroalluaudite Classification
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Dana Class: |
38.2.3.5 (38)Anhydrous Phosphates, etc |
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(38.2)(A+ B++)5 (XO4)3 |
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(38.2.3)Alluaudite-Wyllieite Group (Alluaudite Subgroup) |
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38.2.3.1 Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 21/a 2/m |
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38.2.3.2 Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 21/a 2/m |
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38.2.3.3 Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m |
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38.2.3.4 Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 21/a 2/m |
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38.2.3.5 Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m |
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38.2.3.6 Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m |
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38.2.3.7 Odanielite Na(Zn,Mg)3H2(AsO4)3 C 2/c 2/m |
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38.2.3.8 Johillerite Na(Mg,Zn)3Cu(AsO4)3 I2/c 2/m |
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38.2.3.9 Nickenichite Na0,8Ca0,4(Mg,Fe,Al)3Cu0,4(AsO4)3 C 2/c 2/m |
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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 |
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VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na |
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VII/A.06 - Alluaudite- Hagendorfite group |
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VII/A.06-10 Qingheiite Na2(Mn,Mg,Fe)(Al,Fe)(PO4)3 P 21/n 2/m |
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VII/A.06-20 Bobfergusonite Na2Mn5FeAl(PO4)6 P 21/n 2/m |
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VII/A.06-30 Ferrowyllieite (Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3 P 21/n 2/m |
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VII/A.06-40 Wyllieite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 21/n 2/m |
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VII/A.06-50 Rosemaryite (Na,Ca,Mn)(Mn,Fe)(Fe,Fe,Mg)Al(PO4)3 P 21/n 2/m |
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VII/A.06-60 Ferroalluaudite NaCaFe(Fe,Mn,Fe,Mg)2(PO4)3 C 2/a 2/m |
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VII/A.06-70 Alluaudite NaCaFe(Mn,Fe,Fe,Mg)2(PO4)3 C 2/c 2/m |
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VII/A.06-80 Maghagendorfite NaMgMn(Fe,Fe)2(PO4)3 I 21/a 2/m |
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VII/A.06-85 Ferrohagendorfite* (Na,Ca)2Fe(Fe,Fe)2(PO4)3 I 21/a 2/m |
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VII/A.06-90 Hagendorfite NaCaMn(Fe,Fe,Mg)2(PO4)3 I 21/a 2/m |
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VII/A.06-100 Varulite NaCaMn(Mn,Fe,Fe)2(PO4)3 C 2/c 2/m |
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VII/A.06-110 Arseniopleite (Ca,Na)(Na,Pb)Mn(Mn,Mg,Fe)2(AsO4)3 I2/a 2/m |
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VII/A.06-120 Caryinite (Na,Pb)(Ca,Na)(Ca,Mn)(Mn,Mg)2(AsO4)3 I2/c 2/m |
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Other Ferroalluaudite Information
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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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Print or Cut-and-Paste your Ferroalluaudite Specimen Label here :
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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:
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