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Arrojadite-(PbFe)

Formula:
{Pb[ ]}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
System:Monoclinic
Name:For Miguel Arrojado Lisbôa, Brazilian geologist and Redefinition after the new arrojadite nomeclature (CNMMN 05-D, October 2005).


Arrojadite Group

Classification of Arrojadite-(PbFe)

IMA status:Approved 2006
Strunz 8th edition ID:7/B.20-23
Nickel-Strunz 10th (pending) edition ID:8.BF.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
F : With medium-sized and large cations, (OH, etc.):RO4< 0.5:1
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Type Occurrence of Arrojadite-(PbFe)

Type Locality:Sapucaia Mine, Sapucaia do Norte, Galiléia, Doce valley, Minas Gerais, Southeast Region, Brazil

Crystallography of Arrojadite-(PbFe)

Crystal System:Monoclinic
Class (H-M):m - Domatic
Space Group:Bb {B1 1b} {Cc} {C1c1}
Cell Parameters:a = 16.4304Å, b = 9.9745Å, c = 24.5869Å
β = 105.485°
Ratio:a:b:c = 1.647 : 1 : 2.465
Unit Cell Volume:V 3,883.16 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
3.208 (43)
3.019 (100)
2.829 (35)
2.820 (33)
2.750 (29)
2.698 (55)
2.694 (32)

Chemical Properties of Arrojadite-(PbFe)

Formula:
{Pb[ ]}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
All elements listed in formula:Al, Ca, Fe, H, Na, O, P, Pb

Relationship of Arrojadite-(PbFe) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BF.05Arrojadite-(KFe)
{KNa}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
8.BF.05Dickinsonite-(KMnNa)
{KNa}{Mn
2+
 
[ ]}{Ca}{Na
 
3
}{Mn
2+
13
}{Al}[(OH)
 
2
|(PO
 
4
)
 
12
]
8.BF.05Arrojadite-(BaFe)
{Ba[ ]}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
8.BF.05Arrojadite-(SrFe)
{Sr[ ]}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
8.BF.05Arrojadite-(KNa)
{KNa}{Na
 
2
}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
8.BF.05Fluorarrojadite-(BaFe)
{Ba[ ]}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[F
 
2
|HPO
 
4
|(PO4)
 
11
]
8.BF.05Arrojadite-(NaFe)
{Na
 
2
}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
8.BF.05Arrojadite-(BaNa)
{Ba[ ]}{Na
 
2
}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
8.BF.05Fluorarrojadite-(KNa)
{KNa}{Na
 
2
}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[F
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
8.BF.05Fluorarrojadite-(NaFe)
{Na
 
2
}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[F
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
8.BF.10Samuelsonite
(Ca,Ba)Ca
 
8
Fe
2+
2
Mn
2+
2
Al
 
2
[(OH)
 
2
|(PO
 
4
)
 
10
]
8.BF.15Griphite
Na
 
4
Li
 
2
Ca
 
6
(Mn
2+
 
,Fe
2+
 
,Mg)
 
19
Al
 
8
[(F,OH)|(PO
 
4
)
 
3
]
 
8
8.BF.20Nabiasite
BaMn
2+
9
[(OH)
 
2
|(VO
 
4
,AsO
 
4
)
 
6
]

Other Names for Arrojadite-(PbFe)

Synonyms:
IMA2005-056
Other Languages:
German:Arrojadit-(PbFe)
Russian:Арроядит-(PbFe)

Other Information

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 Arrojadite-(PbFe)

Reference List:Cámara, F., Oberti, R., Chopin, C., Medenbach, O. (2006): The arrojadite enigma: I. A new formula and a new model for the arrojadite structure. American Mineralogist, 91, 1249-1259

Chopin, C., Oberti, R., Cámara, F. (2006): The arrojadite enigma: II. Compositional space, new members and nomenclature of the group. American Mineralogist, 91, 1260-1270.

Internet Links for Arrojadite-(PbFe)

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    Localities for Arrojadite-(PbFe)

    (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.
    Brazil
     
    • Southeast Region
      • Minas Gerais
        • Doce valley
          • Galiléia
            • Sapucaia do Norte
    		IMA website
    Mineral and/or Locality
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