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Arrojadite-(SrFe)

Formula:
{Sr[ ]}{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-(SrFe)

IMA status:Approved 2005
Strunz 8th edition ID:7/B.20-22
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-(SrFe)

Type Locality:Hålsjöberg (Horrsjöberg), Torsby, Värmland, Sweden

Crystallography of Arrojadite-(SrFe)

Crystal System:Monoclinic
Class (H-M):m - Domatic
Space Group:Bb (B1 1b) [Cc] {C1c1}
Cell Parameters:a = 16.3992Å, b = 9.94Å, c = 24.4434Å
β = 105.489°
Ratio:a:b:c = 1.65 : 1 : 2.459
Unit Cell Volume:V 3,839.76 ų (Calculated from Unit Cell)

Chemical Properties of Arrojadite-(SrFe)

Formula:
{Sr[ ]}{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, Sr

Relationship of Arrojadite-(SrFe) 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-(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-(SrFe)

Synonyms:
IMA2005-032
Other Languages:
German:Arrojadit-(SrFe)
Russian:Арроядит-(SrFe)

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-(SrFe)

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.

Articles/Blogs about Arrojadite-(SrFe)

Internet Links for Arrojadite-(SrFe)

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    Localities for Arrojadite-(SrFe)

    (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.
    Sweden
     
    • Värmland
      • Torsby
    		American Mineralogist (2006) 91 (8-9), 1260-1270, IMA website
    Mineral and/or Locality
    Google
     
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