Symesite Mineral Data

General Symesite Information

Chemical Formula:

Pb10(SO4)O7Cl4•(H2O)

Composition:

Molecular Weight = 2,439.89 gm

Hydrogen 0.08 % H 0.74 % H₂O

Lead 84.92 % Pb 91.48 % PbO

Sulfur 1.31 % S 3.28 % SO₃

Chlorine 5.81 % Cl 5.81 % Cl

- % Cl -1.31 % -O=Cl₂

Oxygen 7.87 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₁₀(SO₄)O₇Cl₄•(H₂O)

Environment:

Oxidized zone of a Carboniferous Mn-Pb-Cu deposit. Related to the nadorite and kombatite groups

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Merehead Quarry, Somerset, England. Link to MinDat.org Location Data.

Name Origin:

Named for Robert Symes (1937-) of the Department of Mineralogy, the Natural History Museum (London) in recognition of his studies of the ore deposits of South-West England.

Synonym:

ICSD 98741

IMA1998-035

Symesite Crystallography

Axial Ratios:

a:b:c =2.2427:1:1.5496

Cell Dimensions:

a = 19.727, b = 8.796, c = 13.631, Z = 4; alpha = 82.21°, beta = 78.08°, gamma = 100.04° V = 2,257.76 Den(Calc)= 7.18

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: B1

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

By Intensity(I/I_o): 2.911(1), 2.955(0.9), 3.286(0.9),2.793(0.8), 3.768(0.4), 6.573(0.4),

Physical Properties of Symesite

Cleavage:

{001} Perfect

Color:

Venetian pink.

Density:

7.3

Diaphaneity:

Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Symesite

Gladstone-Dale:

CI meas= -0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1577,KPDmeas= 0.1562,KC= 0.1484
Ncalc = 2.07 - 2.08

Optical Data:

Biaxial (?), a=2.12, g=2.16, bire=0.0400

Calculated Properties of Symesite

Electron Density:

Bulk Density (Electron Density)=6.00 gm/cc
note: Specific Gravity of Symesite =7.30 gm/cc.

Fermion Index:

Fermion Index = 0.18
Boson Index = 0.82

Photoelectric:

PE_Symesite=1,587.73 barns/electron
U=PE_Symesite x rElectron Density=9,519.79 barns/cc.

Radioactivity:

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

Symesite Classification

Dana Class:

12.01.09.01 (12)Compound Halides

(12.01)with miscellaneous anions

(12.01.09)Dana Group

12.01.09.01 Symesite! Pb10(SO4)O7Cl4•(H2O) B1 1

Strunz Class:

03.DC.60 03 - HALIDES

03.D - Oxyhalides, Hydroxyhalides and Related Double Halides

03.DC -With Pb (As,Sb,Bi), without Cu

03.DC.60 Symesite! Pb10(SO4)O7Cl4•(H2O) B1 1

Other Symesite Information

References:

NAME( AmMin, vol 85, p 1526) PHYS. PROP.(AmMin, vol 85, p 1526) OPTIC PROP.(AmMin, vol 85, p 1526)

See Also:

Links to other databases for Symesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Symesite

Pb10(SO4)O7Cl4•(H2O)
Dana No: 12.01.09.01 Strunz No: 03.DC.60
Locality:

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