Leadhillite Mineral Data

Leadhillite Mineral Data +

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General Leadhillite Information

Chemical Formula:

Pb4(SO4)(CO3)2(OH)2

Composition:

Molecular Weight = 1,078.90 gm

Hydrogen 0.19 % H 1.67 % H₂O

Lead 76.82 % Pb 88.68 % PbO₂

Carbon 2.23 % C 8.16 % CO₂

Sulfur 2.97 % S 7.42 % SO₃

Oxygen 17.80 % O

______ ______

100.00 % 105.93 % = TOTAL OXIDE

Empirical Formula:

Pb₄(SO₄)(CO₃)₂(OH)₂

Environment:

Secondary mineral.

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

Leadhills, Lanarkshire, Scotland. Link to MinDat.org Location Data.

Name Origin:

Named for the localiy.

Synonym:

ICSD 64807

PDF 35-617

Leadhillite Image

Images:

Leadhillite

Comments: Clear crystal of leadhillite on matrix.
Location: Leadhills, Lanark, Scotland. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Leadhillite Crystallography

Axial Ratios:

a:b:c =0.4373:1:0.5568

Cell Dimensions:

a = 9.08, b = 20.76, c = 11.56, Z = 8; beta = 89.8° V = 2,179.06 Den(Calc)= 6.58

Crystal System:

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

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

By Intensity(I/I_o): 3.53(1), 2.917(0.6), 2.605(0.5),

Forms:

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Forms: [ 0 1 0] [ 1 1 0] [ 0 0 1]

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Crystal Structure:

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Bindi L , Menchetti S , American Mineralogist , 90 (2005) p.1641-1647, Structural changes accompanying the phase transformation between leadhillite, and susannite: a structural study by means of in situ high-temperature single-, crystal X-ray diffraction, Sample: Chah Mileh Mine, Anarak District, Esfahan Province, Iran, Sample: T = 25C

Physical Properties of Leadhillite

Cleavage:

[001] Perfect, [100] Indistinct

Color:

Colorless, Gray, Yellowish, White, Light blue.

Density:

6.26 - 6.55, Average = 6.4

Diaphaniety:

Transparent to translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luminescence:

None.

Luster:

Adamantine

Streak:

white

Optical Properties of Leadhillite

Gladstone-Dale:

CI meas= -0.164 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.133 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1463,KPDmeas= 0.1503,KC= 0.1291

Optical Data:

Biaxial (-), a=1.87, b=2.0085, g=2.01, bire=0.1400, 2V(Calc)=10, 2V(Meas)=10. Dispersion relatively strong.

Calculated Properties of Leadhillite

Electron Density:

r_electron=5.54 gm/cc
note: r_Leadhillite=6.58 gm/cc.

Fermion Index

Fermion Index = 0.17032
Boson Index = 0.82968

Photoelectric:

PE_Leadhillite=1,401.45 barns/electron
U=PE_Leadhillite x r_electron=7,760.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Leadhillite is Not Radioactive

Leadhillite Classification

Dana Class:

17.1.2.1 (17)Compound Carbonates

(17.1)with miscellaneous formulae

(17.1.2)Dana Group

17.1.2.1 Leadhillite Pb4(SO4)(CO3)2(OH)2 P 2₁/a 2/m

Strunz Class:

VI/B.13-50 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. mostly big cations

VI/B.13 - Lanarkite - Susannite series

VI/B.13-10 Lanarkite Pb2(SO4)O C 2/m 2/m

VI/B.13-20 Olsacherite Pb2(SeO4)(SO4) P 2212 2 2 2

VI/B.13-30 Grandreefite Pb2SO4F2 A2/a 2/m

VI/B.13-40 Pseudograndreefite Pb6SO4F1O F 222 2 2 2

VI/B.13-50 Leadhillite Pb4(SO4)(CO3)2(OH)2 P 2₁/a 2/m

VI/B.13-60 Macphersonite Pb4(SO4)(CO3)2(OH)2 Pcab 2/m 2/m 2/m

VI/B.13-70 Susannite Pb4(SO4)(CO3)2(OH)2 R 3 3

Other Leadhillite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Leadhillite

Pb4(SO4)(CO3)2(OH)2
Dana No: 17.1.2.1 Strunz No: VI/B.13-50
Locality:

Notes: