Macphersonite Mineral Data

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General Macphersonite 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 82.75 % PbO

Carbon 2.23 % C 8.16 % CO₂

Sulfur 2.97 % S 7.42 % SO₃

Oxygen 17.80 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₄(SO₄)(CO₃)₂(OH)₂

Environment:

Polymorph of leadhillite and susannite.

IMA Status:

Approved IMA 1985

Locality:

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

Name Origin:

Named after Harry Gordon Macpherson (1925-), mineralogist at the Royal Scottish Museum, Edinburgh, Scotland.

Name Pronunciation:

Macphersonite + Pronunciation

Synonym:

ICSD 54153

PDF 38-354

Macphersonite Image

Images:

Click Here for Larger Macphersonite Image

Macphersonite Linarite

Comments: Colorless macphersonite with blue linarite.
Location: Leadhills, Strathclyde, Scotland, UK. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Macphersonite Crystallography

Axial Ratios:

a:b:c =0.4489:1:0.4125

Cell Dimensions:

a = 10.37, b = 23.1, c = 9.53, Z = 8; V = 2,282.88 Den(Calc)= 6.28

Crystal System:

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

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

By Intensity(I/I_o): 3.234(1), 2.654(0.9), 2.598(0.3),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Steele I M , Pluth J J , Livingstone A , Mineralogical Magazine , 62 (1998) p.451-459, Crystal structure of macphersonite (Pb4SO4(CO3)2(OH)2): comparison with leadhillite, Locality: Leadhills-Wanlockhead orefield, Scotland, Note: space group changed from Pcab to Pbca

Physical Properties of Macphersonite

Cleavage:

{010} Perfect

Color:

White, Pale amber brown, Colorless.

Density:

6.5

Diaphaneity:

Translucent to transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Fluorescent, Short UV=strong yellow, Long UV=strong yellow.

Luster:

Adamantine - Resinous

Streak:

white

Optical Properties of Macphersonite

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1529,KPDmeas= 0.1477,KC= 0.1461
Ncalc = 1.92 - 1.95

Optical Data:

Biaxial (-), a=1.87, b=2, g=2.01, bire=0.1400, 2V(Calc)=28, 2V(Meas)=35. Dispersion r > v.

Calculated Properties of Macphersonite

Electron Density:

Bulk Density (Electron Density)=5.47 gm/cc
note: Specific Gravity of Macphersonite =6.50 gm/cc.

Fermion Index:

Fermion Index = 0.17
Boson Index = 0.83

Photoelectric:

PE_{Macphersonite}=1,401.45 barns/electron
U=PE_{Macphersonite} x rElectron Density=7,666.49 barns/cc.

Radioactivity:

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

Macphersonite Classification

Dana Class:

17.01.04.01 (17)Compound Carbonates

(17.01)with miscellaneous formulae

(17.01.04)Dana Group

17.01.04.01 Macphersonite Pb4(SO4)(CO3)2(OH)2 Pcab 2/m 2/m 2/m

Strunz Class:

05.BF.40 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

05.BF -With (Cl), SO4, PO4, TeO3

05.BF.40 Leadhillite Pb4(SO4)(CO3)2(OH)2 P 2₁/a 2/m

05.BF.40 Macphersonite Pb4(SO4)(CO3)2(OH)2 Pcab 2/m 2/m 2/m

05.BF.40 Susannite Pb4(SO4)(CO3)2(OH)2 R 3 3

Other Macphersonite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

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

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Print or Cut-and-Paste your Macphersonite Specimen Label here :

Macphersonite

Pb4(SO4)(CO3)2(OH)2
Dana No: 17.01.04.01 Strunz No: 05.BF.40
Locality:

Notes: