Mawbyite Mineral Data

Mawbyite Mineral Data +

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General Mawbyite Information

Chemical Formula:

Pb(Fe+++Zn)2(AsO4)2(OH,H2O)2

Composition:

Molecular Weight = 649.02 gm

Zinc 1.01 % Zn 1.25 % ZnO

Iron 16.35 % Fe 21.03 % FeO

Arsenic 23.09 % As 35.41 % As₂O₅

Hydrogen 0.28 % H 2.50 % H₂O

Lead 35.12 % Pb 37.83 % PbO

Oxygen 24.16 % O

______ ______

100.00 % 98.03 % = TOTAL OXIDE

Empirical Formula:

Pb_1.1Fe²⁺_1.9Zn_0.1(AsO₄)₂(OH)_1.8

Environment:

In an arsenic-rich reaction halo in fractures and cavities in a spessartine-quartz rock in the oxidation zone of a metamorphosed stratiform Pb-Zn orebody.

IMA Status:

Approved IMA 1989

Locality:

Kintore open cut, Broken Hill, New South Wales, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for Sir Maurice Alan Edgar Mawby (1904-1977), for his contribution to the Australian mining industry.

Synonym:

ICSD 85132

PDF 45-1468

Mawbyite Image

Images:

Mawbyite

Comments: Brown crystalline mawbyite in quartz.
Location: Kintore Open Cut, Broken Hill, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mawbyite Crystallography

Axial Ratios:

a:b:c =1.4422:1:1.2033

Cell Dimensions:

a = 9.066, b = 6.286, c = 7.564, Z = 2; beta = 114.857° V = 391.13 Den(Calc)= 5.51

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.245(1), 4.647(1), 2.724(0.7),

Crystal Structure:

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Kharisun , Taylor M R , Bevan D J M , Rae A D , Pring A , Mineralogical Magazine , 61 (1997) p.685-691, The crystal structure of mawbyite, PbFe2(AsO4)2(OH)2, Locality: Broken Hill, New South Wales, Australia, type specimen

Physical Properties of Mawbyite

Cleavage:

[001] Good

Color:

Light brown, Reddish brown, Pale orange, Orange brown.

Density:

5.5

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Spherical - Spherical, rounded aggregates.

Habit:

Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.

Hardness:

4 - Fluorite

Luster:

Adamantine

Streak:

orange

Optical Properties of Mawbyite

Gladstone-Dale:

CI meas= -0.145 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.143 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1803,KPDmeas= 0.1806,KC= 0.1577

Optical Data:

Biaxial (-), a=1.94, b=2, g=2.04, bire=0.1000, 2V(Calc)=76, 2V(Meas)=80.

Calculated Properties of Mawbyite

Electron Density:

r_electron=4.90 gm/cc
note: r_Mawbyite=5.51 gm/cc.

Fermion Index

Fermion Index = 0.0816
Boson Index = 0.9184

Photoelectric:

PE_Mawbyite= 628.43 barns/electron
U=PE_Mawbyite x r_electron=3,081.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mawbyite is Not Radioactive

Mawbyite Classification

Dana Class:

40.2.9.4 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.9)Helmutwinklerite Subgroup

40.2.9.1 Tsumcorite PbZnFe(AsO4)2·(H2O) C 2/m 2/m

40.2.9.2 Helmutwinklerite PbZn2(AsO4)2·2(H2O) P1 1

40.2.9.3 Thometzekite Pb(Cu,Zn)2(AsO4)2·2(H2O) C 2/m 2/m

40.2.9.4 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.2.9.5 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2·2(H2O) P1 1

40.2.9.6 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.2.9.7 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.2.9.8 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Strunz Class:

VII/C.31-05 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.31 - Mawbyite - Gartrellite series

VII/C.31-02 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-04 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-05 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-06 Cabalzarite! Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2 C 2/m 2/m

VII/C.31-08 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-10 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-20 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono

VII/C.31-30 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-35 Cobaltlotharmeyerite! Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-36 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-40 Thometzekite Pb(Cu,Zn)2(AsO4)2·2(H2O) C 2/m 2/m

VII/C.31-50 Tsumcorite PbZnFe(AsO4)2·(H2O) C 2/m 2/m

VII/C.31-74 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

VII/C.31-78 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1

VII/C.31-80 Phosphogartrellite! PbCuFe(PO4)2(OH,H2O)2 P1 1

VII/C.31-90 Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri

VII/C.31-92 Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1

VII/C.31-98 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2·2(H2O) P1 1

VII/C.31-100 Helmutwinklerite PbZn2(AsO4)2·2(H2O) P1 1

Other Mawbyite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.74,p1377-1381,1989) OPTIC PROP.(AntBidBlaNic4)

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Mawbyite

Pb(Fe+++Zn)2(AsO4)2(OH,H2O)2
Dana No: 40.2.9.4 Strunz No: VII/C.31-05
Locality:

Notes: