Malhmoodite Mineral Data

Malhmoodite Mineral Data

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General Malhmoodite Information

Chemical Formula:

FeZr(PO4)2·4(H2O)

Composition:

Molecular Weight = 409.07 gm

Zirconium 22.30 % Zr 30.12 % ZrO₂

Iron 13.65 % Fe 17.56 % FeO

Phosphorus 15.14 % P 34.70 % P₂O₅

Hydrogen 1.97 % H 17.62 % H₂O

Oxygen 46.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Zr(PO₄)₂·4(H₂O)

Environment:

Secondary mineral on bladed kolbeckite in pyroxenite vanadium ores.

IMA Status:

Approved IMA 1993

Locality:

Wilson Springs (Potash Sulfur Springs), Garland Co., Arkansas, USA. Link to MinDat.org Location Data.

Name Origin:

Named after Bertha K. Malhmood, long-time secretary and administrative assistant of the Branch of Analytical Laboratories, US Geological Survey.

Synonym:

IMA1992-001

IMA2002-D

Mahlmoodite

Malhmoodite Image

Images:

Malhmoodite

Comments: Small white aggregate of malhmoodite on matrix.
Location: Union Carbide Mine, Wilson Springs (Potash Sulfur Springs), Garland Co., Arkansas, USA. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Malhmoodite Crystallography

Axial Ratios:

a:b:c =1.6826:1:3.5369

Cell Dimensions:

a = 9.12, b = 5.42, c = 19.17, Z = 4; beta = 94.8° V = 944.26 Den(Calc)= 2.88

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.16(1), 4.382(0.8), 9.58(0.75),

Physical Properties of Malhmoodite

Cleavage:

[???] Good

Color:

Cream white.

Diaphaniety:

Transparent to Translucent

Hardness:

3 - Calcite

Luster:

Silky

Streak:

white

Optical Properties of Malhmoodite

Gladstone-Dale:

CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.225,KC= 0.22

Optical Data:

Biaxial (-), a=1.64, b=1.652, g=1.652, bire=0.0120, 2V(Calc)=0, 2V(Meas)=0.

Calculated Properties of Malhmoodite

Electron Density:

r_electron=2.82 gm/cc
note: r_Malhmoodite=2.88 gm/cc.

Fermion Index

Fermion Index = 0.02814
Boson Index = 0.97186

Photoelectric:

PE_Malhmoodite= 34.16 barns/electron
U=PE_Malhmoodite x r_electron= 96.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Malhmoodite is Not Radioactive

Malhmoodite Classification

Dana Class:

40.1.5.1 (40)Hydrated Phosphates, etc

(40.1)where A++ B++ (XO4) · x(H2O)

(40.1.5)Dana Group

40.1.5.1 Malhmoodite FeZr(PO4)2·4(H2O) P 2₁/c 2/m

Strunz Class:

VII/C.09-35 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.09 - Variscite group

VII/C.09-10 Metavariscite AlPO4·2(H2O) P 2₁/n 2/m

VII/C.09-20 Phosphosiderite FePO4·2(H2O) P 2₁/n 2/m

VII/C.09-30 Kolbeckite ScPO4·2(H2O) P 2₁2₁2₁ 2 2 2

VII/C.09-35 Malhmoodite FeZr(PO4)2·4(H2O) P 2₁/c 2/m

VII/C.09-50 Variscite AlPO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-60 Strengite FePO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-70 Mansfieldite AlAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-80 Scorodite FeAsO4·2(H2O) Pcab 2/m 2/m 2/m

VII/C.09-85 Yanomamite In(AsO4)·2(H2O) P bca 2/m 2/m 2/m

VII/C.09-88 Parascorodite! FeAsO4·2(H2O) HEX ? Hex

VII/C.09-90 Koninckite FePO4·3(H2O)(?) Unk Tetra

Other Malhmoodite Information

References:

NAME( Am.Min.,Vol.78,p437) PHYS. PROP.(Am.Min.,Vol.78,p437-440,1993) OPTIC PROP.(Am.Min.,Vol.78,p437-440,1993)

See Also:

Links to other databases for Malhmoodite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Malhmoodite

FeZr(PO4)2·4(H2O)
Dana No: 40.1.5.1 Strunz No: VII/C.09-35
Locality:

Notes: