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Malhmoodite

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Union Carbide Mine, Wilson Springs (Potash Sulfur Springs), Garland Co., Arkansas, USA
© Stephan Wolfsried

Show Malhmoodite Photos (4)
Formula:
FeZr(PO
 
4
)
 
2
·4H
 
2
O
System:MonoclinicColour:Creamy-white
Hardness:3
This page provides mineralogical data about Malhmoodite.

Classification of Malhmoodite

IMA status:Approved
Strunz 8th edition ID:7/C.09-35
Nickel-Strunz 10th (pending) edition ID:8.CE.75

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
Dana 8th edition ID:40.1.5.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
1 : AB(XO4)·xH2O
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Type Occurrence of Malhmoodite

Type Locality:Wilson Springs (Potash Sulfur Springs), Garland Co., Arkansas, USA
Year of Discovery:1993

Physical Properties of Malhmoodite

Lustre:Silky
Colour:Creamy-white
Streak:White
Hardness (Mohs):3

Crystallography of Malhmoodite

Crystal System:Monoclinic
Cell Parameters:a = 9.12Å, b = 5.42Å, c = 19.17Å
β = 94.81°
Ratio:a:b:c = 1.683 : 1 : 3.537
Unit Cell Volume:V 944.24 ų (Calculated from Unit Cell)

Optical Data of Malhmoodite

Type:Biaxial (-)
RI values: nα = 1.640 nβ = 1.652 nγ = 1.652
Maximum Birefringence:δ = 0.012

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:relatively weak

Chemical Properties of Malhmoodite

Formula:
FeZr(PO
 
4
)
 
2
·4H
 
2
O
Essential elements:Fe, H, O, P, Zr
All elements listed in formula:Fe, H, O, P, Zr

Relationship of Malhmoodite to other Species

Related Minerals - Nickel-Strunz Grouping):
8.CE.05Chudobaite
(Na,K)(Mg,Zn)
 
2
H(AsO
 
4
)(OH,O)
 
6
8.CE.05Geigerite
Mn
 
5
[HAsO
 
4
|AsO
 
4
]
 
2
 · 10H
 
2
O
8.CE.10Newberyite
MgHPO
 
4
·3H
 
2
O
8.CE.15Brassite
MgHAsO
 
4
·4H
 
2
O
8.CE.20Phosphorrösslerite
MgHPO
 
4
·7H
 
2
O
8.CE.20Rösslerite
MgHAsO
 
4
·7H
 
2
O
8.CE.25Metaswitzerite
Mn
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CE.25Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
·7H
 
2
O
8.CE.30Lindackerite
CuCu
 
4
[HAsO
 
4
|AsO
 
4
]
 
2
 · 8-9H
 
2
O
8.CE.30IMA2005-053
(Zn,Cu,Co)Cu
 
4
[HAsO
 
4
|AsO
 
4
]
 
2
 · 9H
 
2
O
8.CE.30Pradetite
CoCu
 
4
(AsO
 
4
)
 
2
(AsO
 
3
OH)
 
2
·9H
 
2
O
8.CE.35Bobierrite
Mg
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Annabergite
Ni
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Arupite
Ni
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Erythrite
Co
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Ferrisymplesite
Fe
3+
3
[(OH)
 
3
|(AsO
 
4
)
 
2
] · 5H
 
2
O
8.CE.40Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Köttigite
Zn
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.40Vivianite
Fe
2+
3
(PO
 
4
)
 
2
·8H
 
2
O
8.CE.40Pakhomovskyite
Co
 
3
[PO
 
4
]
 
2
 · 8H
 
2
O
8.CE.45Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
8.CE.50Cattiite
Mg
 
3
(PO
 
4
)
 
2
·22H
 
2
O
8.CE.55Koninckite
Fe
3+
 
[PO
 
4
] · 3H
 
2
O
8.CE.60Kaňkite
FeAsO
 
4
·3.5H
 
2
O
8.CE.65Steigerite
AlVO
 
4
·3H
 
2
O
8.CE.70Metaschoderite
Al
 
2
PO
 
4
VO
 
4
·6H
 
2
O
8.CE.70Schoderite
Al
 
2
PO
 
4
VO
 
4
·8H
 
2
O
8.CE.75Mahlmoodite
8.CE.80Santabarbaraite
Fe
3+
3
[(OH)
 
3
|(PO
 
4
)
 
2
] · 5H
 
2
O
8.CE.85Metaköttigite
(Zn,Fe,Fe)
 
3
(AsO
 
4
)
 
2
·8(H
 
2
O,OH)
8.CE.85Metavivianite
Fe
2+
3-x
Fe
3+
x
(PO
 
4
)
 
2
(OH)x·(8-x)H
 
2
O

Other Names for Malhmoodite

Synonyms:
IMA1992-001Mahlmoodite
German names:
Mahlmoodit
Spanish names:
Mahlmoodita

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 Malhmoodite

Reference List:Milton, C., McGee, J. J. and Evans, H. T., jr. (1993): Mahlmoodite, FeZr(PO4)2.4H2O, a new iron zirconium phosphate mineral from Wilson Springs, Arkansas. American Mineralogist 78, 437-440.

New Minerals (1997), New Minerals 1990-1994.

Internet Links for Malhmoodite

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    Localities for Malhmoodite

    (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.
    UK
     
    • England
      • Cornwall
        • St Agnes District
          • Porthtowan Area
    		BMS Database
    USA
     
    • Arkansas
      • Garland Co.
          • Union Carbide Mine
    		R&M 70:3 pp 154-170
    Mineral and/or Locality
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