Mineral Information and Data:

Admontite
MgB6O7(OH)6 • 4H2O [CNMNC approved formula]

Named for Admont, Austria, near the original locality.

IMA status : Approved Species 1979 (IMA1978-012)
CLASSIFICATION 
Dana
(8th edition) :
26.06.03.01  
  (26) Hydrated Borates Containing Hydroxyl or Halogen
  (26.06)
  (26.06.03)
  
Nickel-Strunz
(10th edition) :
06.FA.15
  (06) Borates
  (06.F) Hexaborates
  (06.FA) Neso-hexaborates
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 12.68 Å, b = 10.07 Å, c = 11.32 Å, β = 109.68°
Crystal Habit: Crystals poorly developed or corroded
  
Color: Colorless
Diaphaneity: Transparent to translucent
Luster: Vitreous
Hardness (Mohs): 2 - 3
Measured Density: 1.83 g/cm3
Fracture: Conchoidal
  
Geologic Setting: In a gypsum deposit.
Mineral Association: Gypsum, anhydrite, hexahydrite, loweite, eugsterite, pyrite, quartz
  
Other Properties: H2O Soluble.
Comments: Slowly decomposed in H2O

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