Global InformationMalhmoodite information
| Malhmoodite | |
|---|---|
 Malhmoodite.Locality: Kerriack Cove, Porthtowan Area, St Agnes District, Cornwall, England, UK.
Yellowish-white sphere on matrix. Field of view 2 mm. | |
| General | |
| Category | Phosphate |
| Formula (repeating unit) | FeZr(PO4)·4H2O |
| IMA symbol | Mmo[1] |
| Strunz classification | 7/C.09-35 |
| Crystal system | Monoclinic |
| Unit cell | a = 9.12 Å b = 5.42 Å c = 19.17 Å β= 94.81° |
| Identification | |
| Formula mass | 409.07 |
| Color | Creamy-white |
| Crystal habit | Spherules |
| Tenacity | Radiating fibers |
| Mohs scale hardness | 3 |
| Luster | Silky |
| Density | 2.877 g/cm3 |
| Optical properties | Biaxial negative |
| Refractive index | nα = 1.640 nβ = 1.652 nγ = 1.652 |
| Birefringence | δ = 0.012 |
| Dispersion | Relatively weak |
| References | [2][3] |
Malhmoodite is a phosphate mineral first discovered at a mine called Union Carbide in Wilson Springs, Arkansas, United States. This mine is 10 km west of Magnet Cove, an alkaline igneous complex, and Union Carbide is in a contact region of alkalic igneous rocks and surrounding sedimentary rocks. The mineral has been approved by the Commission on New Minerals and Mineral Names, IMA, to be named for the late Bertha K. Malhmood, the Administrative Assistant of the Branch of Analytical Laboratories, U.S. Geological Survey.[2]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b Milton, C., McGee, J., and H. Evans (1993) Mahlmoodite, FeZr(PO4)2 4H2O, a new iron zirconium phosphate mineral from Wilson Springs, Arkansas. American Mineralogist. Mag., 78, 437–440.
- ^ Hudson Institute of Mineralogy, 2019, Malhmoodite: https://www.mindat.org/min-2544.html (accessed November 2019)