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.

Name Pronunciation:

Dundasite + Pronunciation

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 - Dipyramidal H-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

Diaphaneity:

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
Ncalc = 1.64 - 1.7

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:

Bulk Density (Electron Density)=3.43 gm/cc
note: Specific Gravity of Dundasite =3.74 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dundasite is Not Radioactive

Dundasite Classification

Dana Class:

16b.02.01.01 (16b)Carbonates - Hydroxyl or Halogen

(16b.02)where (A)m (B)n (XO3)p Zq � x(H2O), with (m+n):p=3:2

(16b.02.01)Dundasite Group

16b.02.01.01 Dundasite PbAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.02 Dresserite BaAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.03 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.04 Petterdite! PbCr2(CO3)2(OH)4•H2O Pbnm 2/m 2/m 2/m

16b.02.01.05 Kochsandorite! CaAl2(CO3)2(OH)4•H2O P nma 2/m 2/m 2/m

Strunz Class:

05.DB.10 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DB -With large and medium-sized cations

05.DB.10 Dresserite BaAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Dundasite PbAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Kochsandorite! CaAl2(CO3)2(OH)4•H2O P nma 2/m 2/m 2/m

05.DB.10 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Petterdite! PbCr2(CO3)2(OH)4•H2O Pbnm 2/m 2/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)

See Also:

Links to other databases for Dundasite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Dundasite

PbAl2(CO3)2(OH)4•(H2O)
Dana No: 16b.02.01.01 Strunz No: 05.DB.10
Locality:

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