Mineral Information and Data:

Aheylite
Fe2+Al6(PO4)4(OH)8 • 4H2O [CNMNC approved formula]

Named for Allen V. Heyl (1918-), economic geologist, U. S. Geological Survey.

IMA status : Approved Species 1996 (IMA1984-036)
CLASSIFICATION 
Dana
(8th edition) :
42.09.03.05  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.09) where (A)3 (XO4)2 Zq · x(H2O)
  (42.09.03) Turquoise Group
  
Nickel-Strunz
(10th edition) :
08.DD.15
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DD) With only medium-sized cations, (OH, etc.):RO4= 2:1
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 7.400 Å, b = 9.896 Å, c = 7.627 Å, a = 110.87°, b = 115.00°, g = 69.96°
Crystal Habit: As crystals, interlocked in felted or matted aggregates to form botryoidal, spherulitic masses; radiating prismatic groups to 5 mm
  
Color: Very pale blue, pale green to blue-green
Diaphaneity: Translucent
Luster: Porcelaneous to subvitreous
Hardness (Mohs): 5 - 5.5
Measured Density: 2.85 g/cm3
Tenacity: May be brittle
Streak: White
  
Geologic Setting: A late stage hydrothermal mineral in a base-metal-tin deposit (Huanuni mine, Bolivia).
Mineral Association: Variscite, sphalerite, vivianite, wavellite, cassiterite, pyrite, quartz (Huanuni mine, Bolivia)
  

 

Aheylite
Light bluish spheres to 1 mm
associated with white, bladed wavellite crystals, variscite and cassiterite.
Origin: Huanuni mine, Oruro Dept., Bolivia (type locality)
Sample size: 2.5 x 1.5 x 1 cm
Photo: Tom Loomis

 

Aheylite
(zoom-in of above)

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