Mineral Information and Data:

Angastonite
CaMgAl2(PO4)2(OH)4 • 7H2O [CNMNC approved formula]

Named for the locality: Angaston, in the Mount Lofty Ranges, 100 km NNE of Adelaide, South Australia, Australia.

IMA status : Approved Species 2008 (IMA2008-008)
CLASSIFICATION 
Dana
(8th edition) :
42.11.08.05  (This Dana# Added)
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.11) where (AB)4 (XO4)3 Zq · x(H2O)
  (42.11.08) Montgomeryite group
  
Nickel-Strunz
(10th edition) :
08.DL.25
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DL) With large and medium-sized cations, (OH, etc.):RO4 = 2:1
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 13.303(1) Å, b = 27.020(2) Å, c = 6.1070(7) Å α = 89.64(1)°, β = 83.44(1)°, γ = 80.444(8)°
Crystal Habit: Forms crust-like aggregates on matrix.
  
Color: White
Diaphaneity: Transparent
Luster: Pearly
Hardness (Mohs): 2
Measured Density: 2.47 g/cm3
Cleavage: {010} Distinct
Streak: White
  
  
Comments: IMA2008-008

 

Angastonite
Origin: Penrice marble quarry, Angaston, Barossa Valley, North Mt Lofty Ranges, Mt Lofty Ranges, South Australia, Australia.
Sample size: Field of view 9mm
Photo: Steve Sorrell - Crocoite.com

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