Malhmoodite
A valid IMA mineral species
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About Malhmoodite
Formula:
FeZr(PO4)2 · 4H2O
Colour:
Creamy-white
Lustre:
Silky
Hardness:
3
Specific Gravity:
2.877 (Calculated)
Crystal System:
Monoclinic
Member of:
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.
Note: In the original description, the mineral name was erroneously written "mahlmoodite". This was later amended by the IMA to the correct name malhmoodite.
Unique Identifiers
Mindat ID:
2544
Long-form identifier:
mindat:1:1:2544:3
GUID
(UUID V4):
(UUID V4):
3b521984-a664-49d6-9b41-370e96b80e78
IMA Classification of Malhmoodite
Approved
IMA Formula:
Fe2+Zr(PO4)2 · 4H2O
First published:
1993
Classification of Malhmoodite
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
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
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
1 : AB(XO4)·xH2O
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Mmo | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Malhmoodite
Silky
Colour:
Creamy-white
Streak:
White
Hardness:
3 on Mohs scale
Density:
2.877 g/cm3 (Calculated)
Comment:
Could not be measured.
Optical Data of Malhmoodite
Type:
Biaxial (-)
RI values:
nα = 1.640 nβ = 1.652(2) nγ = 1.652(2)
Birefringence:
Very low (effectively uniaxial negative).
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
Relatively weak
Optical Extinction:
Parallel extinction and positive elongation.
Chemistry of Malhmoodite
Mindat Formula:
FeZr(PO4)2 · 4H2O
Crystallography of Malhmoodite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 9.12(2) Å, b = 5.42(1) Å, c = 19.17(2) Å
β = 94.81(1)°
β = 94.81(1)°
Ratio:
a:b:c = 1.683 : 1 : 3.537
Unit Cell V:
944.24 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Spherules of radiating fibers
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.58 Å | (75) |
4.572 Å | (65) |
4.382 Å | (80) |
4.092 Å | (60) |
3.160 Å | (100) |
2.640 Å | (70) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) | |
High-𝑇 alteration and/or metamorphism | |
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Malhmoodite
General Appearance of Type Material:
Small (<0.5 mm) cream white spheres. The spherules consist of thin, flat, radiating, crystals.
Place of Conservation of Type Material:
Smithsonian Institution, Washington, D.C., USA.
Associated Minerals at Type Locality:
Reference:
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.
Synonyms of Malhmoodite
Other Language Names for Malhmoodite
German:Malhmoodit
Spanish:Malhmoodita
Relationship of Malhmoodite to other Species
Common Associates
Associated Minerals Based on Photo Data:
4 photos of Malhmoodite associated with Diopside-Hedenbergite Series | |
3 photos of Malhmoodite associated with Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
2 photos of Malhmoodite associated with Pyrochlore Group | A2Nb2(O,OH)6Z |
1 photo of Malhmoodite associated with Turquoise | CuAl6(PO4)4(OH)8 · 4H2O |
1 photo of Malhmoodite associated with Calcite | CaCO3 |
Related Minerals - Strunz-mindat Grouping
8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O |
8.CE. | Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O |
8.CE.05 | Chudobaite | (Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O |
8.CE.05 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O |
8.CE.10 | Newberyite | Mg(PO3OH) · 3H2O |
8.CE.15 | Brassite | Mg(HAsO4) · 4H2O |
8.CE.20 | Phosphorrösslerite | Mg(PO3OH) · 7H2O |
8.CE.20 | Rösslerite | Mg(HAsO4) · 7H2O |
8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O |
8.CE.25 | Switzerite | Mn2+3(PO4)2 · 7H2O |
8.CE.30 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O |
8.CE.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O |
8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O |
8.CE.30 | Pradetite | CoCu4(AsO4)2(HAsO4)2 · 9H2O |
8.CE.30 | Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O |
8.CE.30 | Hloušekite | (Ni,Co)Cu4(AsO4)2(AsO3OH)2 · 9H2O |
8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O |
8.CE.40 | Annabergite | Ni3(AsO4)2 · 8H2O |
8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O |
8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O |
8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O |
8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O |
8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O |
8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O |
8.CE.40 | Manganohörnesite | Mn2+3(AsO4)2 · 8H2O |
8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O |
8.CE.40 | Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O |
8.CE.45 | Symplesite | Fe2+3(AsO4)2 · 8H2O |
8.CE.50 | Cattiite | Mg3(PO4)2 · 22H2O |
8.CE.55 | Koninckite | Fe3+PO4 · 3H2O |
8.CE.60 | Kaňkite | FeAsO4 · 3.5H2O |
8.CE.60 | Hilarionite | Fe3+2(SO4)(AsO4)(OH) · 6H2O |
8.CE.65 | Steigerite | Al(VO4) · 3H2O |
8.CE.70 | Metaschoderite | Al2(PO4)(VO4) · 6H2O |
8.CE.70 | Schoderite | Al2(PO4)(VO4) · 8H2O |
8.CE.75 | Zigrasite | MgZr(PO4)2 · 4H2O |
8.CE.75 | UM2009-11-PO:CaHZr | CaZr[PO4]2 · 4H2O |
8.CE.80 | Santabarbaraite | Fe3+3(PO4)2(OH)3 · 5H2O |
8.CE.85 | Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) |
8.CE.90 | Slavkovite | Cu13(AsO4)6(AsO3OH)4 · 23H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Malhmoodite
mindat.org URL:
https://www.mindat.org/min-2544.html
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Please feel free to link to this page.
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References for Malhmoodite
Localities for Malhmoodite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Belgium | |
| BLONDIEAU M. et al. (2017) |
| BLONDIEAU M. et al. (2017) |
| Blondieau et al. (2017) |
France | |
| Fourcault J.-M. (2021) |
UK | |
| Elton et al. (1995) |
USA (TL) | |
| American Mineralogist +2 other references |
| Howard +1 other reference |
| Yang et al. (2022) |
Quick NavTopAbout MalhmooditeUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
North Wilson pit, Union Carbide Mine, Wilson Springs, Garland County, Arkansas, USA