Alluaudite Mineral Data

Alluaudite Mineral Data +

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General Alluaudite Information

Chemical Formula:

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

Composition:

Molecular Weight = 482.77 gm

Sodium 2.86 % Na 3.85 % Na₂O

Calcium 0.83 % Ca 1.16 % CaO

Magnesium 0.50 % Mg 0.83 % MgO

Manganese 13.66 % Mn 17.63 % MnO

Iron 23.14 % Fe 33.08 % Fe₂O₃

Phosphorus 19.25 % P 44.10 % P₂O₅

Oxygen 39.77 % O

______ ______

100.00 % 100.66 % = TOTAL OXIDE

Empirical Formula:

Na_0.6Mn²⁺_0.2Ca_0.1Mn²⁺Fe³⁺₂Mg_0.1(PO₄)₃

Environment:

Sodium metasomatism of triphylite-lithiophilite phosphatic nodules in granite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1848

Locality:

La Vilate quarry, near Chanteloube, Haute-Vienne, France. Link to MinDat.org Location Data.

Name Origin:

Named for Francois Alluaud, mining engineer of Limoges, France, who discovered the mineral.

Synonym:

Huhnerkobelite

ICSD 75441

PDF 42-581

Alluaudite Image

Images:

Alluaudite

Comments: Nearly pure crystalline dark green brown mass of alluaudite.
Location: Warusenge Pegmatite, Buranga, Rwanda. Scale: Size Not Given.
© John Veevaert

Images:

Alluaudite Heterosite

Comments: Purple crystalline heterosite with yellow coatings of alluaudite.
Location: Palermo Mine, North Groton, Grafton County, New Hampshire, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Alluaudite Crystallography

Axial Ratios:

a:b:c =0.9577:1:0.5109

Cell Dimensions:

a = 12.004, b = 12.533, c = 6.404, Z = 4; beta = 114.4° V = 877.40 Den(Calc)= 3.65

Crystal System:

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

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

By Intensity(I/I_o): 2.73(1), 6.3(0.8), 3.07(0.65),

Crystal Structure:

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Moore P B , American Mineralogist , 56 (1971) p.1955-1975, Crystal chemistry of the alluaudite structure type: Contribution to the, paragenesis of pegmatite phosphate giant crystals

View Additional jPOWD Structure files for Alluaudite
[1] [10] [11] [12] [13] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Alluaudite

Cleavage:

[010] Good, [110] Good

Color:

Brownish yellow, Green, Yellow, Black.

Density:

3.45 - 3.58, Average = 3.51

Diaphaniety:

Subtranslucent to Opaque

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

5-5.5 - Apatite-Knife Blade

Streak:

brownish yellow

Optical Properties of Alluaudite

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2209,KPDmeas= 0.2294,KC= 0.2311

Optical Data:

Biaxial (+), a=1.782, b=1.802, g=1.835, bire=0.0530, 2V(Calc)=78, 2V(Meas)=50-90. Dispersion r > v moderate.

Pleochroism (x):

pale olive green, straw yellow, or greenish yellow.

Pleochroism (z):

pale olive greenish or brownish yellow.

Calculated Properties of Alluaudite

Electron Density:

r_electron=3.39 gm/cc
note: r_Alluaudite=3.52 gm/cc.

Fermion Index

Fermion Index = 0.00561
Boson Index = 0.99439

Photoelectric:

PE_Alluaudite= 11.57 barns/electron
U=PE_Alluaudite x r_electron= 39.22 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Alluaudite is Not Radioactive

Alluaudite Classification

Dana Class:

38.2.3.6 (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.06-70 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 Alluaudite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

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

Alluaudite

NaCaFe++(Mn,Fe++,Fe+++,Mg)2(PO4)3
Dana No: 38.2.3.6 Strunz No: VII/A.06-70
Locality:

Notes: