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Alluaudite-Na□

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Formula:
□
 
4
Na
 
4
Mn
2+
4
Fe
3+
8
(PO
 
4
)
 
12
System:MonoclinicColour:Greenish black, brownish ...
Hardness:5
Member of:Alluaudite Group
Name:A name proposed in 1971 by Moore and later by Moore & Ito (1979) for a member of the Alluaudite Group.
This page provides mineralogical data about Alluaudite-Na□.

Classification of Alluaudite-Na□

IMA status:Not Approved
mindat.org URL:http://www.mindat.org/min-31862.html
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Physical Properties of Alluaudite-Na□

Lustre:Sub-Vitreous, Resinous, Greasy
Diaphaneity (Transparency):Translucent
Colour:Greenish black, brownish black
Streak:Brown
Hardness (Mohs):5
Tenacity:Brittle
Cleavage:Distinct/Good
{010, {-101} good
Fracture:Irregular/Uneven
Density (measured):3.52 - 3.58 g/cm3
Density (calculated):3.6 g/cm3

Crystallography of Alluaudite-Na□

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Space Group Setting:C2/c
Cell Parameters:a = 12.004Å, b = 12.533Å, c = 6.404Å
β = 114.4°
Ratio:a:b:c = 0.958 : 1 : 0.511
Unit Cell Volume:V 877.40 ų (Calculated from Unit Cell)
Z:4
Twinning:Polysynthyetic
Comment:Am Min 56:1955-1975 structure
X-Ray Powder Diffraction:
d-spacingIntensity
6.27 (80)
5.47 (40)
3.50 (40)
3.07 (50)
2.87 (30)
2.73 (50)
2.72 (100)
2.52 (40)
Comments:ICDD 42-581; see also 14-245

Optical Data of Alluaudite-Na□

Type:Biaxial (+)
RI values: nα = 1.764 - 1.782 nβ = 1.779 - 1.802
2V:Measured: 78° to 79°
Birefringence:0.053
Maximum Birefringence:δ = 1.764

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r>v; crossed
Pleochroism:Visible
Comments:X = pale olive to greenish yellow Z light yellow to medium olive green
Comments:RI increases rapidly with increasing ferric iron.

Chemical Properties of Alluaudite-Na□

Formula:
□
 
4
Na
 
4
Mn
2+
4
Fe
3+
8
(PO
 
4
)
 
12
Essential elements:Fe, Mn, Na, O, P
All elements listed in formula:Fe, Mn, Na, O, P

Relationship of Alluaudite-Na□ to other Species

Member of:Alluaudite Group
Other Members of Group:

- +
Alluaudite
(Na,Ca)Mn
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(PO
 
4
)
 
3
Alluaudite-Ca□
□
 
4
Ca
 
4
Mn
2+
4
Fe
3+
8
(PO
 
4
)
 
12
Arseniopleite
NaCaMn
2+
 
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
Bradaczekite
NaCu
 
4
(AsO
 
4
)
 
3
Caryinite
(Na,Pb)(Ca,Na)(Ca,Mn
2+
 
)(Mn
2+
 
,Mg,Fe
3+
 
)
 
2
(AsO
 
4
)
 
3
Ferroalluaudite
(Na,Ca)Fe
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
)
 
2
(PO
 
4
)
 
3
Ferroalluaudite-NaNa
Na
 
4
Na
 
4
Fe
2+
4
Fe
3+
8
(PO
 
4
)
 
12
Ferrohagendorfite
NaCaFe
2+
 
Fe
2+
2
(PO
 
4
)
 
3
Groatite
NaCaMn
 
2
(PO
 
4
)(HPO
 
4
)
 
2
Hagendorfite
NaCaMn
2+
 
Fe
2+
2
(PO
 
4
)
 
3
Johillerite
Na(Mg,Zn)
 
3
Cu(AsO
 
4
)
 
3
Maghagendorfite
NaMn(Mg,Fe,Fe)
 
3
(PO
 
4
)
 
3
Nickenichite
Na
 
0.8
Ca
 
0.4
Cu
 
0.4
(Mg,Fe)
 
3
(AsO
 
4
)
 
3
O'Danielite
Na(Zn,Mg)
 
3
H
 
2
(AsO
 
4
)
 
3
Varulite
NaCaMn
2+
 
Mn
2+
2
(PO
 
4
)
 
3
Yazganite
NaFe
3+
2
(Mg,Mn
2+
 
)(AsO
 
4
)
 
3
 · H
 
2
O

Other Information

Fluorescence in UV light:Not fluorescent.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Alluaudite-Na□

Reference List:

- +
American Mineralogist (1955) 40:1100.

Moore, Paul B., 1971, Crystal Chemistry of the Alluaudite Structure Type: Contribution to the Paragenesis of Pegmatite Phosphate Giant Crystals, American Mineralogist, v. 56, p. 1955-1975.

Moore, P.B. and Ito, J. (1979) Mineralogical Magazine: 43: 227-235.

Neues Jahbuch MM 82 (1986).

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    • Localities for Alluaudite-Na□

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    France
     
    • Limousin
      • Haute-Vienne
        • Razès
          • Chanteloube
    		Moore and Ito, 1971, Mineralogical Magazine 43:227
    Morocco
     
    • Marrakech-Tensift-El Haouz Region
      • El Kelaâ des Sraghna Province
    		Van King
    Namibia
     
    • Erongo Region
      • Karibib District
    		Van King
    Rwanda
     
    • Western Province
      • Gatumba District
    		Van King
    Sweden
     
    • Västerbotten
      • Skellefteå
    		Moore and Ito, 1971, Mineralogical Magazine 43:227
    USA
     
    • South Dakota
      • Custer Co.
        • Custer District
          • Fourmile
    		Moore, P. B., 2000, Analyses of Primary Phosphates from Pegmatites in Maine and Other Localities, in V. T. King (editor), Mineralogy of Maine. Mining History, Gems, and Geology, Maine Geological Survey, Augusta, Maine, p. 333-336.
          • Pringle
    		Moore and Ito, 1971, Mineralogical Magazine 43:227
    Moore, P. B., 2000, Analyses of Primary Phosphates from Pegmatites in Maine and Other Localities, in V. T. King (editor), Mineralogy of Maine. Mining History, Gems, and Geology, Maine Geological Survey, Augusta, Maine, p. 333-336.
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