Macphersonite Mineral Data

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.

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),

Physical Properties of Macphersonite

Cleavage:

[010] Perfect

Color:

White, Pale amber brown, Colorless.

Density:

6.5

Diaphaniety:

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

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:

r_electron=5.47 gm/cc
note: r_{Macphersonite}=6.50 gm/cc.

Fermion Index

Fermion Index = 0.17032
Boson Index = 0.82968

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Macphersonite is Not Radioactive

Macphersonite Classification

Dana Class:

17.1.4.1 (17)Compound Carbonates

(17.1)with miscellaneous formulae

(17.1.4)Dana Group

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

Strunz Class:

VI/B.13-60 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 Macphersonite Information

References:

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

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Macphersonite

Pb4(SO4)(CO3)2(OH)2
Dana No: 17.1.4.1 Strunz No: VI/B.13-60
Locality:

Notes: