Mineral Information and Data:

Arsendescloizite
PbZnAsO4(OH) [CNMNC approved formula]

Named as the arsenate analog of "descloizite.".

IMA status : Approved Species 1992 (IMA1979-030)
CLASSIFICATION 
Dana
(8th edition) :
41.05.01.09  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.05) where (A B)2 (XO4) Zq
  (41.05.01) Adelite Group
  
Nickel-Strunz
(10th edition) :
08.BH.35
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BH) With medium-sized and large cations, (OH,etc.):RO4 = 1:1
  
Crystal system: Orthorhombic System
Point group (H-M): 222 — disphenoidal
Unit cell: a = 6.07Å, b = 9.35Å, c = 7.63Å
Crystal Habit: As roselike aggregates of tabular {001} crystals, to 0.5 mm, with forms {001}, {011}, {101}, and {111}; may be mammillary.
  
Color: Pale yellow to pale green
Diaphaneity: Transparent
Luster: Subadamantine
Hardness (Mohs): 4 - 5
Measured Density: 5.67 g/cm3
Streak: White
  
Geologic Setting: A secondary mineral in oxidized hydrothermal polymetallic deposits.
Mineral Association: Tennantite, chalcocite, willemite, mimetite, quartz, goethite (Tsumeb, Namibia)
  

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