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Arrojadite-(BaFe)

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


Arrojadite Group

Classification of Arrojadite-(BaFe)

IMA status:Approved 1994
Explanation of status:CNMMN redefinition 05-D, October 2005
Strunz 8th edition ID:7/B.20-25
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-(BaFe)

Type Locality:Groppera Alp (Scalcoggia Valley-Groppera Valley), San Giacomo Valley, Madesimo, Spluga Valley, Sondrio Province, Lombardy, Italy

Crystallography of Arrojadite-(BaFe)

Crystal System:Monoclinic

Optical Data of Arrojadite-(BaFe)

Type:Biaxial (+/-)
Dispersion:relatively strong

Chemical Properties of Arrojadite-(BaFe)

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

Relationship of Arrojadite-(BaFe) 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-(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.05Arrojadite-(PbFe)
{Pb[ ]}{Fe
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-(BaFe)

Synonyms:
IMA1994-033Sigismundite
Other Languages:
German:Sigismundit
Russian:Арроядит-(BaFe)
Сигизмундит
Spanish:Sigismundita

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-(BaFe)

Reference List:Demartin, F., Gramaccioli, C.M., Pilati, T., Sciesa, E. (1996): Sigismundite, (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)12, a new Ba-rich member of the arrojadite group from Spluga Valley, Italy. Canadian Mineralogist, 34, 827-834.

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.

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    Localities for Arrojadite-(BaFe)

    (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.
    Italy
     
    • Lombardy
      • Sondrio Province
        • Spluga Valley
          • Madesimo
            • San Giacomo Valley
    		Demartin, F., Gramaccioli, C.M., Pilati, T., Sciesa, E. (1996): Sigismundite, (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)12, a new Ba-rich member of the arrojadite group from Spluga Valley, Italy. Canadian Mineralogist, 34, 827-834.
    Mineral and/or Locality
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