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
Similar Names
| Mahlmoodit | A synonym of 'Malhmoodit' |
| Mahlmoodita | A synonym of 'Malhmoodita' |
IMA Classification of Malhmoodite
Approved
IMA Formula:
Fe2+Zr4+(PO4)2(H2O)4
Approval year:
1992
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 for Standard |
|---|---|---|
| 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 = 1.64 nβ = 1.652(2) nγ = 1.652(2)
Birefringence:
Very low (effectively uniaxial negative).
Max. Birefringence:
δ = 0.012
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
Relatively weak
Optical Extinction:
Parallel extinction and positive elongation.
Chemistry of Malhmoodite
Mindat Formula:
FeZr(PO4)2 · 4H2O
Element Weights:
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-? subsurface aqueous alteration (see also #23) | |
| High-? 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:
Synonyms of Malhmoodite
Other Language Names for Malhmoodite
Relationship of Malhmoodite to other Species
Common Associates
Associations Based on Photo Data:
| 5 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 |
| 2 photos of Malhmoodite associated with Calcite | CaCO3 |
| 1 photo of Malhmoodite associated with Turquoise | CuAl6(PO4)4(OH)8 · 4H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CE. | Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O |
| 8.CE. | Belmonteite | CaMn2(AsO4)2 · 7H2O |
| 8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O |
| 8.CE.05 | Chudobaite | Mg5(AsO4)2(AsO3OH)2 · 10H2O |
| 8.CE.05 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.10 | Newberyite | Mg(PO3OH) · 3H2O |
| 8.CE.10 | Manganonewberyite | Mn(PO3OH)(H2O)3 |
| 8.CE.15 | Fanguangite | (MoO2)(PO3OH) · 4H2O |
| 8.CE.15 | Brassite | Mg(HAsO4) · 4H2O |
| 8.CE.20 | Phosphorrösslerite | Mg(PO3OH) · 7H2O |
| 8.CE.20 | Rösslerite | Mg(HAsO4) · 7H2O |
| 8.CE.25 | Switzerite | Mn2+3(PO4)2 · 7H2O |
| 8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O |
| 8.CE.30 | Pradetite | CoCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Lindackerite | CuCu4(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.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O |
| 8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O |
| 8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Gritsenkoite | CoMg2(AsO4)2(H2O)8 |
| 8.CE.40 | Cabrerite | NiMg2(AsO4)2 · 8H2O |
| 8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O |
| 8.CE.40 | Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
| 8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O |
| 8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O |
| 8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O |
| 8.CE.40 | Manganohörnesite | Mn2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O |
| 8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O |
| 8.CE.40 | Annabergite | Ni3(AsO4)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
Please feel free to link to this page.
Please feel free to link to this page.
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References for Malhmoodite
Localities for Malhmoodite
Showing 9 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Belgium | |
| Blondieau et al. (2017) |
| Blondieau et al. (2017) |
| Blondieau et al. (2017) |
France | |
| Fourcault J.-M. (2021) |
Morocco | |
| Favreau (2026) |
UK | |
| Elton et al. (1995) |
USA (TL) | |
| Milton et al. (1993) +2 other references |
| Howard +1 other reference |
| Yang et al. (2022) |
Quick NavTopAbout MalhmooditeUnique IdentifiersSimilar NamesIMA 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