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Alluaudite-Ca□

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Formula:
□
 
4
Ca
 
4
Mn
2+
4
Fe
3+
8
(PO
 
4
)
 
12
System:MonoclinicColour:Greenish black
Hardness:4½
Member of:Alluaudite Group
Name:Originally named huhnerkobelite by Marie Louise Lindberg [Smith] in 1950 for the type locality in Bavaria, Germany. Renamed without redescription by Moore & Ito (1979) for the calcium + vacancy member of the Alluaudite Group. Note: The "huhnerkobelite" of Moore (1965, Am Min 50:713-717) is not true huhnerkobelite, but is the Na-rich member of the series.
This page provides mineralogical data about Alluaudite-Ca□.

Classification of Alluaudite-Ca□

IMA status:Not Approved
mindat.org URL:http://www.mindat.org/min-31863.html
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Physical Properties of Alluaudite-Ca□

Lustre:Sub-Vitreous, Resinous, Greasy
Diaphaneity (Transparency):Translucent
Colour:Greenish black
Streak:Gray
Hardness (Mohs):4½
Hardness Data:Estimated
Tenacity:Brittle
Cleavage:Distinct/Good
Two good cleavages, probably {010} and {100} by analogy.
Fracture:Irregular/Uneven

Crystallography of Alluaudite-Ca□

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 = 12.33Å, b = 12.49Å, c = 6.51Å
β = 115.45°
Ratio:a:b:c = 0.987 : 1 : 0.521
Unit Cell Volume:V 905.26 ų (Calculated from Unit Cell)
Comment:ICDD 6-482
X-Ray Powder Diffraction:
d-spacingIntensity
8.76 (60)
6.30 (50)
5.44 (20)
3.49 (30)
3.33 (30)
3.21 (20)
2.72 (100)
2.53 (30)
Comments:ICDD 6-482

Chemical Properties of Alluaudite-Ca□

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

Relationship of Alluaudite-Ca□ 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-Na□
□
 
4
Na
 
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-Ca□

Reference List:

- +
Lindberg, M. L., 1950, Arrojadite, huhnerkobelite and graftonite, American Mineralogist, v. 35, p. 59-76.

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.

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    Locality Updated: Lichtloch 25, Copper-Silver smelter (Gottesbelohnung smelter; slag locality), Hettstedt, Mansfeld Basin, Saxony-Anhalt, GermanyFrom Bert de Ruiter, 18th Feb 2012 09:06:08