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Malhmoodite

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About MalhmooditeHide

Formula:
FeZr(PO4)2 · 4H2O
Colour:
Creamy-white
Lustre:
Silky
Hardness:
3
Specific Gravity:
2.877 (Calculated)
Crystal System:
Monoclinic
Name:
For Bertha K. Malhmood, for many years Administrative Assistant of the Branch of Analytical Laboratories, U.S. Geological Survey.
Note: In the original description, the mineral name was erroneously written "mahlmoodite". This was later amended by the IMA to the correct name malhmoodite.
The Fe2+-analogue of zigrasite.


Classification of MalhmooditeHide

Approved
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
40.1.5.1

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

Physical Properties of MalhmooditeHide

Silky
Colour:
Creamy-white
Streak:
White
Hardness:
Density:
2.877 g/cm3 (Calculated)

Optical Data of MalhmooditeHide

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

Formula:
FeZr(PO4)2 · 4H2O
IMA Formula:
Fe2+Zr(PO4)2 · 4H2O

Crystallography of MalhmooditeHide

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

Type Occurrence of MalhmooditeHide

Synonyms of MalhmooditeHide

Other Language Names for MalhmooditeHide

German:Mahlmoodit
Spanish:Mahlmoodita

Related Minerals - Nickel-Strunz GroupingHide

8.CE.XBabánekiteCu3(AsO4)2 · 8H2O Mon. 2/m : B2/m
8.CE.05Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.05GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
8.CE.10NewberyiteMg(HPO4) · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.15BrassiteMg(HAsO4) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CE.20PhosphorrössleriteMg(HPO4) · 7H2OMon. 2/m : P2/b
8.CE.20RößleriteMg(HAsO4) · 7H2OMon. 2/m : B2/b
8.CE.25MetaswitzeriteMn2+3(PO4)2 · 4H2OMon. 2/m : P2/b
8.CE.25Switzerite(Mn,Fe)3(PO4)2 · 7H2OMon.
8.CE.30LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30OndrušiteCaCu4(AsO4)2(HAsO4)2 · 10H2OTric. 1 : P1
8.CE.30VeselovskýiteZnCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30PradetiteCoCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
8.CE.30KlajiteMnCu4(AsO4)2(HAsO4)2 · 9-10H2OTric. 1 : P1
8.CE.35BobierriteMg3(PO4)2 · 8H2OMon. 2/m : B2/b
8.CE.40AnnabergiteNi3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40ErythriteCo3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2O
8.CE.40HörnesiteMg3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
8.CE.40ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.40PakhomovskyiteCo3(PO4)2 · 8H2OMon. 2/m : B2/m
8.CE.45SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
8.CE.50CattiiteMg3(PO4)2 · 22H2OTric. 1 : P1
8.CE.55KoninckiteFe3+PO4 · 3H2OTet.
8.CE.60KaňkiteFeAsO4 · 3.5H2OMon.
8.CE.65SteigeriteAl(VO4) · 3H2OMon. 2/m : P21/m
8.CE.70MetaschoderiteAl2(PO4)(VO4) · 6H2OMon. 2/m : P2/m
8.CE.70SchoderiteAl2(PO4)(VO4) · 8H2OMon.
8.CE.75ZigrasiteMgZr(PO4)2 · 4H2OTric. 1 : P1
8.CE.75Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2OTric.
8.CE.80SantabarbaraiteFe3+3(PO4)2(OH)3 · 5H2OAmor.
8.CE.85Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

40.1.5.2ZigrasiteMgZr(PO4)2 · 4H2OTric. 1 : P1
40.1.5.3Unnamed (Ca-analogue of Zigrasite)CaZr[PO4]2 · 4H2OTric.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MalhmooditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 MalhmooditeHide

Localities for MalhmooditeHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Belgium
 
  • Liège Province
    • Stavelot Massif
      • Lienne valley
BLONDIEAU M., PUCCIO S., COMPERE P., HATERT F. (2017) - Données nouvelles sur quelques espèces minérales de Vielsalm et de Salmchâteau. Bulletin de la Société Royale des Sciences de Liège, Vol. 86, p. 1 - 48
  • Luxembourg Province
    • Stavelot Massif
BLONDIEAU M., PUCCIO S., COMPERE P., HATERT F. (2017) - Données nouvelles sur quelques espèces minérales de Vielsalm et de Salmchâteau. Bulletin de la Société Royale des Sciences de Liège, Vol. 86, p. 1 - 48
UK
 
  • England
    • Cornwall
      • Portreath
BMS Database
USA (TL)
 
  • Arkansas
    • Garland Co.
American Mineralogist, Volume 78, pages 437-440, 1993; Smith, Art, Collecting Arkansas Minerals; Rocks & Min. (1995): 70: 154-170.
        • Union Carbide Mine
R&M 70:3 pp 154-170
Mineral and/or Locality  
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