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Symesite

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Bob Symes and his book
Formula:
Pb10(SO4)O7Cl4 · H2O
Colour:
Pink
Lustre:
Adamantine, Vitreous
Hardness:
4
Specific Gravity:
7.3
Crystal System:
Triclinic
Name:
Named for Robert Symes (1937- May 2016) 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.



Hide all sections | Show all sections

Classification of SymesiteHide

Approved
Approval Year:
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

Physical Properties of SymesiteHide

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

Optical Data of SymesiteHide

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 SymesiteHide

Formula:
Pb10(SO4)O7Cl4 · H2O
IMA Formula:
Pb10SO4O7Cl4 · H2O

Crystallography of SymesiteHide

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 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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.911 (100)
3.286 (90)
2.955 (90)
2.793 (80)
6.573 (40)
3.768 (40)

Type Occurrence of SymesiteHide

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

Other Language Names for SymesiteHide

German:Symesit
Spanish:Symesita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Rickturnerite2 photos of Symesite associated with Rickturnerite on mindat.org.
Mereheadite2 photos of Symesite associated with Mereheadite on mindat.org.
Hydrocerussite2 photos of Symesite associated with Hydrocerussite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.DC.05LaurionitePbCl(OH)Orth. mmm (2/m 2/m 2/m)
3.DC.05ParalaurionitePbCl(OH)Mon. 2/m : B2/m
3.DC.10FiedleritePb3FCl4(OH) · H2OMon. 2/m
3.DC.15PenfielditePb2Cl3(OH)Hex. 6 : P6
3.DC.20LaurelitePb7F12Cl2Hex. 6 : P6
3.DC.25Bismoclite(BiO)ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
3.DC.25Daubréeite(BiO)(OH,Cl)Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
3.DC.25MatlockitePbFClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
3.DC.25RorisiteCaFClTet.
3.DC.25Zavaritskite(BiO)FTet.
3.DC.25ZhangpeishaniteBaFClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
3.DC.30NadoritePbSbClO2Orth. mmm (2/m 2/m 2/m) : Cmcm
3.DC.30PeritePbBiClO2Orth. mmm (2/m 2/m 2/m) : Cmcm
3.DC.35AravaipaitePb3AlF9 · H2OTric.
3.DC.37CalcioaravaipaitePbCa2AlF9Tric. 1
3.DC.40ThorikositePb3Cl2(OH)(SbO3,AsO3)Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DC.45MereheaditePb47Cl25(OH)13O24(CO3)(BO3)2Mon. m
3.DC.50BlixitePb2(O,OH)2ClOrth.
3.DC.55PinalitePb3WO5Cl2Orth.
3.DC.65EcdemitePb6Cl4(As2O7)Tet.
3.DC.65HeliophyllitePb6Cl4(As2O7)Orth.
3.DC.70MendipitePb3Cl2O2Orth. 2 2 2 : P21 21 21
3.DC.75DamaraitePb3Cl(OH)O2Orth. mm2 : Pmc21
3.DC.80OnoratoiteSb8Cl2O11Tric. 1 : P1
3.DC.85CotunnitePbCl2Orth. mmm (2/m 2/m 2/m)
3.DC.90PseudocotunniteK2PbCl4Orth.
3.DC.95BarstowitePb4Cl6(CO3) · H2OMon. 2/m : P21/m

Other InformationHide

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

Pronounciation of SymesiteHide

Pronounciation:
PlayRecorded byFrom
Jolyon & Katya RalphUnited Kingdom

References for SymesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 SymesiteHide

Localities for SymesiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • North Rhine-Westphalia
    • Sauerland
      • Brilon
Lapis 25(12), 47 (2000); Turner, R.W., Siidra, O.I., Rumsey, M.S., Polekhovsky, Y.S., Kretser, Y.L., Krivovichev, S.V., Spratt, J., Stanley, C.J. (2015): Yeomanite, Pb2O(OH)Cl, a new chain-structured Pb oxychloride from Merehead Quarry, Somerset, England. Mineralogical Magazine, 79, 1203-1211.
UK (TL)
 
  • 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. Mineralogical Magazine vol. 70, no. 6, pp 629 - 653
Mineral and/or Locality  
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