Symesite Mineral Data

Symesite Mineral Data

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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

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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 - PinacoidalH-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),

Crystal Structure:

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Welch M D , Cooper M A , Hawthorne F C , Criddle A J , American Mineralogist , 85 (2000) p.1526-1533, Symesite, Pb10(SO4)O7Cl4(H2O), a new PbO-related sheet mineral: Description and, crystal structure

Physical Properties of Symesite

Cleavage:

[001] Perfect

Color:

Venetian pink.

Density:

7.3

Diaphaniety:

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= -0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1588,KPDmeas= 0.1562,KC= 0.1484

Optical Data:

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

Calculated Properties of Symesite

Electron Density:

r_electron=6.00 gm/cc
note: r_Symesite=7.30 gm/cc.

Fermion Index

Fermion Index = 0.18781
Boson Index = 0.81219

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Symesite is Not Radioactive

Symesite Classification

Dana Class:

12.1.9.1 (12)Compound Halides

(12.1)with miscellaneous anions

(12.1.9)Dana Group

12.1.9.1 Symesite ! Pb10(SO4)O7Cl4·(H2O) B1 1

Strunz Class:

III/D.10-140 III - Halogenides

III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds

III/D.10 - Cotunnite - Matlockite series

III/D.10-10 Fiedlerite Pb3Cl4F(OH)2 P1 1

III/D.10-20 Paralaurionite PbCl(OH) C 2/m 2/m

III/D.10-30 Laurionite PbCl(OH) Pnam 2/m 2/m 2/m

III/D.10-40 Cotunnite PbCl2 Pnam 2/m 2/m 2/m

III/D.10-50 Pseudocotunnite K2PbCl4(?) P nma 2/m 2/m 2/m

III/D.10-60 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m

III/D.10-65 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m

III/D.10-70 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m

III/D.10-80 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m

III/D.10-90 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m

III/D.10-140 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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST

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

Symesite

Pb10(SO4)O7Cl4·(H2O)
Dana No: 12.1.9.1 Strunz No: III/D.10-140
Locality:

Notes: