Mineral Information and Data:

Tsumebite
Pb2Cu(PO4)(SO4)(OH) [CNMNC approved formula]

Named for the locality: Tsumeb, Namibia.

IMA status : Valid species (Pre-IMA 1912) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
43.04.02.01  
  (43) Compound Phosphates
  (43.04) (Anhydrous Compound Anions With Hydroxyl or Halogen)
  (43.04.02) Tsumebite Group
  
Nickel-Strunz
(10th edition) :
08.BG.05
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BG) With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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