Mineralogy Database

Alluaudite Mineral Data

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General Alluaudite Information

Help on Chemical  Formula: Chemical Formula: NaCaFe++(Mn,Fe++,Fe+++,Mg)2(PO4)3
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na0.6Mn2+0.2Ca0.1Mn2+Fe3+2Mg0.1(PO4)3
Help on Environment: Environment: Sodium metasomatism of triphylite-lithiophilite phosphatic nodules in granite pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1848
Help on Locality: Locality: La Vilate quarry, near Chanteloube, Haute-Vienne, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Francois Alluaud, mining engineer of Limoges, France, who discovered the mineral.
Help on Name Pronunciation: Name Pronunciation: Alluaudite + Pronunciation Say ALLUAUDITE
Help on Synonym: Synonym: Huhnerkobelite
  ICSD 75441
  PDF 42-581
 

Alluaudite Image

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  Alluaudite

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

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  Heterosite   Alluaudite

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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9577:1:0.5109
Help on Cell Dimensions: Cell Dimensions: a = 12.004, b = 12.533, c = 6.404, Z = 4; beta = 114.4° V = 877.40 Den(Calc)= 3.65
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.73(1), 6.3(0.8), 3.07(0.65),
 

Physical Properties of Alluaudite

Help on Cleavage: Cleavage: {010} Good, {110} Good
Help on Color: Color: Brownish yellow, Green, Yellow, Black.
Help on Density: Density: 3.45 - 3.58, Average = 3.51
Help on Diaphaneity: Diaphaneity: Subtranslucent to Opaque
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Streak: Streak: brownish yellow
 

Optical Properties of Alluaudite

Help on Gladstone-Dale: 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
Ncalc = 1.8 - 1.84
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): pale olive green, straw yellow, or greenish yellow.
Help on Pleochroism (z): Pleochroism (z): pale olive greenish or brownish yellow.
 

Calculated Properties of Alluaudite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.39 gm/cc
note: Specific Gravity of Alluaudite =3.52 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0056104415
Boson Index = 0.9943895585
Help on Photoelectric: Photoelectric: PEAlluaudite = 11.57 barns/electron
U=PEAlluaudite x rElectron Density= 39.22 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alluaudite is Not Radioactive
 

Alluaudite Classification

Help on  Dana Class: Dana Class: 38.02.03.06 (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
Help on  Strunz Class: 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 Alluaudite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Alluaudite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Scandinavian mineral gallery
16 - WWW-MINCRYST

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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: 38.02.03.06 Strunz No: 08.AC.10
Locality:

 

Notes:

 

 
   
 


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