Dundasite Mineral Data

Dundasite Mineral Data +

General Dundasite Information

Chemical Formula:

PbAl2(CO3)2(OH)4·(H2O)

Composition:

Molecular Weight = 467.23 gm

Aluminum 11.55 % Al 21.82 % Al₂O₃

Hydrogen 1.29 % H 11.57 % H₂O

Lead 44.35 % Pb 47.77 % PbO

Carbon 5.14 % C 18.84 % CO₂

Oxygen 37.67 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbAl₂(CO₃)₂(OH)₄·(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1893

Locality:

Dundas and Mt. Read, Tasmania. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 9348

PDF 21-936

Dundasite Image

Images:

Dundasite

Comments: Bluish crystalline spray of Dundasite on azurite.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Dundasite Crystallography

Axial Ratios:

a:b:c =0.5535:1:0.3431

Cell Dimensions:

a = 9.05, b = 16.35, c = 5.61, Z = 4; V = 830.10 Den(Calc)= 3.74

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbmm

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

By Intensity(I/I_o): 7.91(1), 3.6(0.8), 3.09(0.6),

Physical Properties of Dundasite

Cleavage:

[010] Perfect

Color:

Sky blue, White, Light green.

Density:

3.41 - 3.55, Average = 3.48

Diaphaniety:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2 - Gypsum

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Dundasite

Gladstone-Dale:

CI meas= -0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1843,KPDmeas= 0.1981,KC= 0.1878

Optical Data:

Biaxial (-), a=1.602, b=1.716, g=1.75, bire=0.1480, 2V(Calc)=54, 2V(Meas)=30-40.

Calculated Properties of Dundasite

Electron Density:

r_electron=3.43 gm/cc
note: r_Dundasite=3.74 gm/cc.

Fermion Index

Fermion Index = 0.09875
Boson Index = 0.90125

Photoelectric:

PE_Dundasite= 743.64 barns/electron
U=PE_Dundasite x r_electron=2,547.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Dundasite is Not Radioactive

Dundasite Classification

Dana Class:

16b.2.1.1 (16b)Carbonates - Hydroxyl or Halogen

(16b.2)where (A)m (B)n (XO3)p Zq · x(H2O), with (m+n):p=3:2

(16b.2.1)Dana Group

16b.2.1.1 Dundasite PbAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

16b.2.1.2 Dresserite BaAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

16b.2.1.3 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

16b.2.1.4 Petterdite! PbCr2(CO3)2(OH)4·H2O Pbnm 2/m 2/m 2/m

16b.2.1.5 Kochsandorite! CaAl2(CO3)2(OH)4·H2O P nma 2/m 2/m 2/m

Strunz Class:

V/E.08-90 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.08 - Strontiodresserite - Dundasite series

V/E.08-05 Thomasclarkite-(Y)! (Na,Ce)(Y,REE)(HCO3)(OH)3·4(H2O) P 2 2

V/E.08-10 Kamphaugite-(Y) Ca(Y,REE)(CO3)2(OH)2·3(H2O) P 4₁2₁2 4 2 2

V/E.08-20 Calcio-ancylite-(Ce) CaCe(CO3)2(OH)·(H2O) P mmm 2/m 2/m 2/m

V/E.08-25 Calcio-ancylite-(Nd) CaNd(CO3)2(OH)·(H2O) Pm m

V/E.08-28 Ancylite-(La)! Sr(La,Ce)(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m

V/E.08-30 Ancylite-(Ce) SrCe(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m

V/E.08-40 Gysinite-(Nd) Pb(Nd,La)(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m

V/E.08-50 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

V/E.08-60 Dresserite BaAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

V/E.08-70 Hydrodresserite BaAl2(CO3)2(OH)4·3(H2O) P1 1

V/E.08-80 Montroyalite Sr4Al8(CO3)3(OH,F)26·10-11(H2O) Unk. Tri

V/E.08-90 Dundasite PbAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

V/E.08-95 Petterdite! PbCr2(CO3)2(OH)4·H2O Pbnm 2/m 2/m 2/m

V/E.08-100 Barstowite Pb4(CO3)Cl6·(H2O) P 2₁/m 2/m

Other Dundasite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Dundasite

PbAl2(CO3)2(OH)4·(H2O)
Dana No: 16b.2.1.1 Strunz No: V/E.08-90
Locality:

Notes: