Mineral Information and Data:

Allanpringite
Fe3+3(PO4)2(OH)3 • 5H2O [CNMNC approved formula]

Named for Allan Pring, eminent Australian mineralogist.

IMA status : Approved Species 2004 (IMA2004-050)
CLASSIFICATION 
Dana
(8th edition) :
42.10.02.02  (This Dana# Added)
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.10) where (AB)3 (XO4)2 Zq · x(H2O)
  (42.10.02) Wavellite Group
  
Nickel-Strunz
(10th edition) :
08.DC.50
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DC) With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: P21/m
Unit cell: a = 9.777(3) Å, b = 7.358(2) Å, c = 17.83(5) Å β = 92.19(4)°
Crystal Habit: Acicular, invariably twinned (by nonmerohedry) crystals, which are always intergrown to form bundles of subparallel individuals
  
Color: Pale brownish yellow
Diaphaneity: Translucent to transparent
Luster: Vitreous
Hardness (Mohs): 3
Measured Density: 2.54 g/cm3
Cleavage: 2: {hk0} Perfect, {010} Good
Tenacity: Brittle
Fracture: Irregular/Uneven
Streak: White with a pale yellowish tint
  
Geologic Setting: Secondary mineral on dump of the abandoned mine.
  
Comments: The monoclinic-pseudoorthorhombic Fe3+-analogue of the orthorhombic Al-phosphate Wavellite.

 

Allanpringite
Pale brownish yellow crystals of allanpringite with cacoxenite and beraunite.
Origin: Grube Mark, Essershausen, Weilburg, Taunus, Gerrmany.
Photo: Diederik Visser

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