Mineral Information and Data:

Arsentsumebite
Pb2Cu(AsO4)(SO4)(OH) [CNMNC approved formula]

Named as the "arsenate" analog of "tsumebite.".

IMA status : Valid species (Pre-IMA 1935) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
43.04.02.02  
  (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
Unit cell: a = 8.85Å, b = 5.92Å, c = 7.84Å β = 112.6°
Crystal Habit: As distorted crystals, to 2 mm, in aggregates and crusts.
Twinning: Complex, observed.
  
Color: Grass-green to apple-green
Diaphaneity: Semi-transparent
Luster: Vitreous
Hardness (Mohs): 3.5
Measured Density: 6.46 g/cm3
Tenacity: Brittle
Fracture: Uneven
  
Geologic Setting: A rare mineral in the oxidized zone of a dolostone-hosted hydrothermal polymetallic ore deposit (Tsumeb, Namibia); in a hydrothermal polymetallic barite–fluorite deposit (Clara mine, Germany).
Mineral Association: Malachite, cerussite, azurite, smithsonite, mimetite, bayldonite, conichalcite,
duftite, quartz, iron oxide (Tsumeb, Namibia).
  

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