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Symesite

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Bob Symes and his book
Formula:
Pb10(SO4)O7Cl4 · H2O
System:
Triclinic
Colour:
Pink
Lustre:
Adamantine, Vitreous
Hardness:
4
Name:
Named for Robert Symes (b. 1937) of the Department of Mineralogy, The Natural History Museum, London, England
Nadorite Group.
Related to mereheadite.

Krivovichev et al. (2009) mention a possible carbonate analogue of symesite.

Classification of Symesite

Approved 1998
3/D.10-140
3.DC.60

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
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http://www.mindat.org/min-11033.html
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First Recorded Occurrence of Symesite

Place of Conservation of First Recorded Material:
Natural History Museum, London (Specimen # BM1998,37).
Year of Discovery:
1998
Geological Setting of First Recorded Material:
oxidised zone of Mn-Pb-Cu deposit

Physical Properties of Symesite

Adamantine, Vitreous
Diaphaneity (Transparency):
Translucent
Comment:
"adamantine" added, since Welch et al. (2000) indicate R.I. > 2
Colour:
Pink
Streak:
White
Hardness (Mohs):
4
Cleavage:
Perfect
Density:
7.3(2) g/cm3 (Measured)    7.23 g/cm3 (Calculated)

Crystallography of Symesite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.821(6) Å, b = 10.776(6) Å, c = 13.134(7) Å
α = 68.96(4)°, β = 86.52(5)°, γ = 75.65(4)°
Ratio:
a:b:c = 0.819 : 1 : 1.219
Unit Cell Volume:
V 1128.4 ų
Z:
2
Morphology:
Aggregates of blocky crystals.
Comment:
Welch et al. (2000) use non-standard setting: space group B-1, with a = 19.727(2), b = 8.796(1), c = 13.631(2) Å, alpha = 82.21(1), beta = 78.08(1), gamma = 100.04(1)°, V = 2242.4(5) Å3, Z = 4. P > B transformation matrix is [0-1-1|100|01-1]
X-Ray Powder Diffraction Data:
d-spacingIntensity
2.911 (100)
3.286 (90)
2.955 (90)
2.793 (80)
6.573 (40)
3.768 (40)

Optical Data of Symesite

Type:
Biaxial
RI values:
nα = 2.120 nγ = 2.160
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Type:
Anisotropic
Anisotropism:
weak anisotropy in crossed polars
Dispersion:
r < v
Reflectivity:
400nmR1=17.20%R2= 17.95%imR1= 5.07%imR2= 5.65%
420nmR1=16.50%R2= 17.40%imR1= 4.69%imR2= 5.28%
440nmR1=15.90%R2= 16.90%imR1= 4.40%imR2= 4.99%
460nmR1=15.50%R2= 16.50%imR1= 4.17%imR2= 4.77%
470nmR1=15.20%R2= 16.30%imR1= 4.07%imR2= 4.67%
480nmR1=15.10%R2= 16.10%imR1= 3.98%imR2= 4.58%
500nmR1=14.90%R2= 15.80%imR1= 3.83%imR2= 4.43%
520nmR1=14.50%R2= 15.50%imR1= 3.70%imR2= 4.30%
540nmR1=14.30%R2= 15.30%imR1= 3.61%imR2= 4.19%
546nmR1=14.20%R2= 15.30%imR1= 3.59%imR2= 4.17%
560nmR1=14.10%R2= 15.20%imR1= 3.53%imR2= 4.11%
580nmR1=14.00%R2= 15.00%imR1= 3.47%imR2= 4.05%
589nmR1=13.90%R2= 15.00%imR1= 3.44%imR2= 4.02%
600nmR1=13.90%R2= 14.90%imR1= 3.43%imR2= 3.99%
620nmR1=13.80%R2= 14.80%imR1= 3.39%imR2= 3.96%
640nmR1=13.80%R2= 14.80%imR1= 3.37%imR2= 3.93%
660nmR1=13.70%R2= 14.70%imR1= 3.34%imR2= 3.90%
680nmR1=13.60%R2= 14.65%imR1= 3.32%imR2= 3.88%
700nmR1=13.60%R2= 14.60%imR1= 3.30%imR2= 3.86%
nmR1=%R2=%imR1=%imR2=%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 17.95%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
grey

Chemical Properties of Symesite

Formula:
Pb10(SO4)O7Cl4 · H2O
Essential elements:
All elements listed in formula:
Analytical Data:
Ideal composition from structural formula of Welch et al. (2000). Experimental analyses show no other major/minor components.
PbO (91.48)
SO3 (3.28)
Cl (5.81)
H2O (0.74)
O=Cl (-1.31)

Relationship of Symesite to other Species

3.DC.05LaurionitePbCl(OH)
3.DC.05ParalaurionitePbCl(OH)
3.DC.10FiedleritePb3FCl4(OH) · H2O
3.DC.15PenfielditePb2Cl3(OH)
3.DC.20LaurelitePb7F12Cl2
3.DC.25Bismoclite(BiO)Cl
3.DC.25Daubréeite(BiO)(OH,Cl)
3.DC.25MatlockitePbFCl
3.DC.25RorisiteCaFCl
3.DC.25Zavaritskite(BiO)F
3.DC.25ZhangpeishaniteBaFCl
3.DC.30NadoritePbSbClO2
3.DC.30PeritePbBiClO2
3.DC.35AravaipaitePb3F3[AlF6] · H2O
3.DC.37CalcioaravaipaitePbCa2AlF9
3.DC.40ThorikositePb3Cl2(OH)(SbO3,AsO3)
3.DC.45MereheaditePb47Cl25(OH)13O24(CO3)(BO3)2
3.DC.50BlixitePb2(O,OH)2Cl
3.DC.55PinalitePb3WO5Cl2
3.DC.65EcdemitePb6Cl4(As2O7)
3.DC.65HeliophyllitePb6Cl4(As2O7)
3.DC.70MendipitePb3Cl2O2
3.DC.75DamaraitePb3Cl(OH)O2
3.DC.80OnoratoiteSb8Cl2O11
3.DC.85CotunnitePbCl2
3.DC.90PseudocotunniteK2PbCl4
3.DC.95BarstowitePb4Cl6(CO3) · H2O

Other Names for Symesite

Name in Other Languages:
German:Symesit
Spanish:Symesita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Symesite

Reference List:
Welch, M.D. et al. (2000): Symesite, Pb10 (SO4) O7 Cl4 (H2O), a new PbO-related sheet mineral: Description and crystal structure. American Mineralogist 85, 1526-1533.

Krivovichev, S.V., Turner, R., Rumsey, M., Siidra, O.I., Kirk. C.A. (2009): The crystal structure and chemistry of mereheadite. Mineralogical Magazine, 73, 103-117.

Internet Links for Symesite

Localities for Symesite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • North Rhine-Westphalia
    • Sauerland
      • Brilon
Lapis 25(12), 47 (2000)
UK
 
  • England
    • Somerset
      • Cranmore
Amer.Min.(2000) 85, 1526-1533; Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46; Turner, R.W., (2006) A Mechanism for the formation of the Mineralised Mn Deposits at Merehead Quarry, Cranmore, Somerset, England. Min. Mag. vol. 70, no. 6, pp 629 - 653
Mineral and/or Locality  
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