Mineral Information and Data:

Ammonioborite
(NH4)3B15O20(OH)8 • 4H2O [CNMNC approved formula]

Named for its composition, ammonium borate.

IMA status : Valid species (Pre-IMA 1931) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
26.05.03.01  
  (26) Hydrated Borates Containing Hydroxyl or Halogen
  (26.05)
  (26.05.03)
  
Nickel-Strunz
(10th edition) :
06.EA.15
  (06) Borates
  (06.E) Pentaborates
  (06.EA) Neso-pentaborates
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 25.27 Å, b = 9.65 Å, c = 11.56 Å, b = 94.287°
Crystal Habit: Crystals microscopic, platy grouped in parallel position; compact and fine-grained granular masses
  
Color: White
Diaphaneity: Translucent
Measured Density: 1.77 g/cm3
  
Geologic Setting: In boric acid-rich fumarolic lagoons.
Mineral Association: Sassolite, larderellite
  
Other Properties: H2O Soluble.
Comments: Dissolves in H2O slowly.

<<< BACK TO MINERAL SEARCH