Mineral Information and Data:

Hidalgoite
PbAl3(SO4)(AsO4)(OH)6 [CNMNC approved formula]

Named for the locality: San Pascual mine, nine km northwest of Zimapan, Hidalgo, Mexico.

IMA status : Approved Species 1953 ()
CLASSIFICATION 
Dana
(8th edition) :
43.04.01.03  
  (43) Compound Phosphates
  (43.04) (Anhydrous Compound Anions With Hydroxyl or Halogen)
  (43.04.01) Beudantite Group
  
Nickel-Strunz
(10th edition) :
08.BL.05
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BL) With medium-sized and large cations, (OH, etc.):RO4 = 3:1
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
  
  
  

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