Symesite Mineral Data

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General Symesite Information

Help on Chemical  Formula: Chemical Formula: Pb10(SO4)O7Cl4·(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Pb10(SO4)O7Cl4·(H2O)
Help on Environment: Environment: Oxidized zone of a Carboniferous Mn-Pb-Cu deposit. Related to the nadorite and kombatite groups
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Merehead Quarry, Somerset, England. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Synonym: Synonym: ICSD 98741
  IMA1998-035
 

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Symesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.2427:1:1.5496
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: B1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.911(1), 2.955(0.9), 3.286(0.9),2.793(0.8), 3.768(0.4), 6.573(0.4),
Click Here for Large Symesite Structure Window Crystal Structure:

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Help on Above


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

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Venetian pink.
Help on Density: Density: 7.3
Help on Diaphaniety: Diaphaniety: Translucent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Blocky - Crystal shape tends to be equant (e.g. feldspars).
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Symesite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (?), a=2.12, g=2.16, bire=0.0400
 

Calculated Properties of Symesite

Help on Electron Density: Electron Density:

relectron=6.00 gm/cc
note: rSymesite =7.30 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.18781
Boson Index = 0.81219
Help on Photoelectric: Photoelectric:

PESymesite =1,587.73 barns/electron
U=PESymesite x relectron=9,519.79 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Symesite is Not Radioactive

 

Symesite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin, vol 85, p 1526) PHYS. PROP.(AmMin, vol 85, p 1526) OPTIC PROP.(AmMin, vol 85, p 1526)
Help on See Also: 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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Symesite

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

 

Notes:

 

 
   
 
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