Mineral Information and Data:

Bayldonite
Cu3PbO(AsO3OH)2(OH)2 [CNMNC approved formula]

Named after John Bayldon of England.

IMA status : Valid species (Pre-IMA 1865) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
41.05.14.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.05) where (A B)2 (XO4) Zq
  (41.05.14)
  
Nickel-Strunz
(10th edition) :
08.BH.45
  (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: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: C2/c
Unit cell: a = 10.147Å, b = 5.892Å, c = 14.081Å; β = 106.5°
Crystal Habit: Rare as crystals, to 1 cm. Usually as mammillary crusts, powdery, fine-grained massive.
Twinning: As pseudoscalenohedral trillings with composition plane (311)
  
Color: Siskin-green, apple-green, yellow-green, grass-green; dark green to black in crystals; may show sector twinning in thin section.
Diaphaneity: Translucent
Luster: Resinous
Hardness (Mohs): 4.5
Measured Density: 5.24 – 5.65 g/cm3
Fracture: Conchoidal to uneven
  
Geologic Setting: A rare secondary mineral in the oxidized zone of some polymetallic deposits.
Mineral Association: Mimetite, olivenite, azurite, malachite, tsumebite, cuprian adamite, duftite, keyite, schultenite, philipsbornite (Tsumeb, Namibia); beudantite, anglesite, cerussite, malachite, azurite, barite (Kayrakty, Kazakhstan)
  
Other Properties: Gemstone Unlikely Available.

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