Mineral Information and Data:

Angelellite
Fe3+4O3(AsO4)2 [CNMNC approved formula]

Named to honor Dr. Victorio Angelelli (1908- ), Argentinean mining geologist, Director of the Argentinean Geological Survey.

IMA status : Approved Species 1959 ()
CLASSIFICATION 
Dana
(8th edition) :
41.06.10.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.06) where (A)2 (XO4) Zq
  (41.06.10)
  
Nickel-Strunz
(10th edition) :
08.BC.05
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BC) With only medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 5.036(3) Å, b = 6.461Å, c = 6.594Å α = 114.4°, β = 116.4°, γ = 81.9°
Crystal Habit: Crystals usually tabular; globular and crystalline incrustations
  
Color: Reddish brown, blackish brown, dark brown
Diaphaneity: Translucent
Luster: Adamantine to submetallic
Hardness (Mohs): 5.5
Measured Density: 4.87 g/cm3
Cleavage: 1; {001}
Tenacity: Brittle
Fracture: Conchoidal
Streak: Reddish brown
  
Geologic Setting: Probably of exhalative origin, in tin ore.
Mineral Association: Cassiterite, hematite.
  

 

Angelellite
Reddish brown microcrystalline angelellite on matrix.
Origin: Cerro Pululus Tin Mine, Jujuy, Argentina.
Photo: Jeff Weissman

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