Mineral Information and Data:

Symesite
Pb10SO4O7Cl4 • H2O [CNMNC approved formula]

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.

IMA status : Approved Species 1998 ()
CLASSIFICATION 
Dana
(8th edition) :
12.01.09.01  
  (12) Compound Halides
  (12.01) with miscellaneous anions
  (12.01.09)
  
Nickel-Strunz
(10th edition) :
03.DC.60
  (03) Halides
  (03.D) Oxyhalides, Hydroxyhalides and Related Double Halides
  (03.DC) With Pb (As,Sb,Bi), without Cu
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  

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