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Phosphosiderite

Big Photo

Folgosinho Quarry, Folgosinho, Gouveia, Guarda District, Portugal
© JM. Johannet

Show Phosphosiderite Photos (127)
Formula:
FePO
 
4
·2H
 
2
O
System:MonoclinicColour:Purple to reddish ...
Hardness:3½ - 4
Name:From its composition, being a PHOSPHate, and from the Greek σίδηρος "SIDERos" for iron.
Dimorph of:Strengite


Metavariscite Group.

Classification of Phosphosiderite

IMA status:Approved
Strunz 8th edition ID:7/C.09-20
Nickel-Strunz 10th (pending) edition ID:8.CD.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
Dana 8th edition ID:40.4.3.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
Hey's CIM Ref.:19.13.3

19 : Phosphates
13 : Phosphates of Fe alone
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Type Occurrence of Phosphosiderite

Type Locality:Kalterborn Mine, Eiserfeld, Siegerland, North Rhine-Westphalia, Germany
Year of Discovery:1890

Occurrences of Phosphosiderite

Geological Setting:Alteration product of triphylite in granitic pegmatites, soils, replcement mineral in bones and shells.

Physical Properties of Phosphosiderite

Lustre:Vitreous, Resinous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Purple to reddish violet, rose-red, peachy-pink, brownish yellow, moss-green, colourless; rose to colourless in transmitted light.
Hardness (Mohs):3½ - 4
Cleavage:Distinct/Good
On {010}, good; on {001}, indistinct.
Fracture:Irregular/Uneven
Density (measured):2.74 - 2.76 g/cm3
Density (calculated):2.76 g/cm3

Crystallography of Phosphosiderite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 5.32Å, b = 9.79Å, c = 8.71Å
β = 90.51°
Ratio:a:b:c = 0.543 : 1 : 0.89
Unit Cell Volume:V 453.62 ų (Calculated from Unit Cell)
Morphology:Crystals tabular {010} or stout prismatic [001]. Also occurs as botryoidal or reniform masses and crusts with a radial-fibrous structure.
Twinning:On {101}, commonly as interpenetration twins.

Optical Data of Phosphosiderite

Type:Biaxial (-)
RI values: nα = 1.692 nβ = 1.725 nγ = 1.738
2V:Measured: 62° , Calculated: 62°
Maximum Birefringence:δ = 0.046

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r > v, very strong
Pleochroism:Visible
Comments:X = ^c ~ 4° = Light rose
Y = b = Carmine-red
Z = Colourless

Chemical Properties of Phosphosiderite

Formula:
FePO
 
4
·2H
 
2
O
Essential elements:Fe, H, O, P
All elements listed in formula:Fe, H, O, P
Common Impurities:Al,Mn

Relationship of Phosphosiderite to other Species

Member of Group:
Metavariscite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
8.CD.05Kolbeckite
ScPO
 
4
·2H
 
2
O
8.CD.05Metavariscite
AlPO
 
4
·2H
 
2
O
8.CD.05UM2005-02-AsO:AlHPScSi
ScAsO
 
4
·2H
 
2
O
8.CD.10Mansfieldite
AlAsO
 
4
·2H
 
2
O
8.CD.10Scorodite
Fe
3+
 
AsO
 
4
·2H
 
2
O
8.CD.10Strengite
FePO
 
4
·2H
 
2
O
8.CD.10Variscite
AlPO
 
4
·2H
 
2
O
8.CD.10Yanomamite
InAsO
 
4
·2H
 
2
O
8.CD.15Parascorodite
Fe
3+
 
AsO
 
4
·2H
 
2
O
8.CD.20Ludlamite
(Fe,Mn,Mg)
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CD.25Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
·4H
 
2
O
8.CD.30Rollandite
Cu
 
3
(AsO
 
4
)
 
2
·4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.13.1Barbosalite
Fe
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
19.13.2Strengite
FePO
 
4
·2H
 
2
O
19.13.4Dufrénite
Ca
 
0.5
Fe
2+
 
Fe
3+
5
[(OH)
 
3
|(PO
 
4
)
 
2
]
 
2
 · 2H
 
2
O
19.13.5Giniite
Fe
2+
 
Fe
3+
4
[(OH)
 
5
|(PO
 
4
)
 
3
] · 2H
 
2
O
19.13.6Whitmoreite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
19.13.7Tinticite
Fe
3+
5.34
(PO
 
4
)
 
3.62
(VO
 
4
)
 
0.38
(OH)
 
4
·6.7H
 
2
O
19.13.8Ferristrunzite
Fe
3+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
3
 · 5H
 
2
O
19.13.9Ferrostrunzite
Fe
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 6H
 
2
O
19.13.10Beraunite
Fe
2+
 
Fe
3+
5
[(OH)
 
5
|(PO
 
4
)
 
4
] · 4H
 
2
O
19.13.11Vivianite
Fe
2+
3
(PO
 
4
)
 
2
·8H
 
2
O
19.13.12Metavivianite
Fe
2+
3-x
Fe
3+
x
(PO
 
4
)
 
2
(OH)x·(8-x)H
 
2
O

Other Names for Phosphosiderite

Synonyms:
ClinobarranditeClinostrengiteMetastrengite
Other Languages:
German:Phosphosiderit
Clinostrengit
Klinostrengit
Metastrengit
Italian:Fosfosiderite
Russian:Фосфосидерит
Меташтренгит
Spanish:Clinostrengita
Metastrengita
Varieties:
Vilateite

Other Information

Other Information:Totally soluble in HCl, nearly insoluble in HNO3.
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 Phosphosiderite

Reference List:Bruhns and Busz (1890) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 17: 555.

Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 823.

Lacroix, A. (1910) Minéralogie de la France et des ses colonies, Paris. 5 volumes: vol. 4: 477 (as Vilateite ?)

Goldschmidt, V. (1920) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 6: 152.

Laubmann and Steinmetz (1920) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 55: 523.

Müllbauer (1925) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 61: 318.

De Angelis (1926) Ann. Mus. Civ. Stor. Nat. Genova: 52: 138.

Koechlin (1934) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 290.

McConnell (1939) American Mineralogist: 24: 636.

Strunz and Sztrókay (1939) Zentralblatt Mineralien: 272.

McConnell (1940) American Mineralogist: 25: 719 (as Clinobarrandite).

McConnell (1943) Bulletin of the Geological Society of America: 54: 707.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 769-771.

American Mineralogist (1966): 51: 168.

Internet Links for Phosphosiderite

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    Localities for Phosphosiderite

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