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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

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 - Pinacoidal H-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),

Physical Properties of Symesite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Venetian pink.
Help on Density: Density: 7.3
Help on Diaphaneity: Diaphaneity: 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= -0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1577,KPDmeas= 0.1562,KC= 0.1484
Ncalc = 2.07 - 2.08
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: Bulk Density (Electron Density)=6.00 gm/cc
note: Specific Gravity of Symesite =7.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.18
Boson Index = 0.82
Help on Photoelectric: Photoelectric: PESymesite =1,587.73 barns/electron
U=PESymesite x rElectron Density=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)Compound Halides
  (12.01)with miscellaneous anions
  (12.01.09)Dana Group Symesite! Pb10(SO4)O7Cl4•(H2O) B1 1
Help on  Strunz Class: 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

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 - 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

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Dana No: Strunz No: 03.DC.60





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