Mineral Information and Data:

Ameghinite
NaB3O3(OH)4 [CNMNC approved formula]

Named for Carlos Ameghino (1865-1936) and Florentino Ameghino (1854-1911), both brothers and Argentine geologists.

IMA status : Approved Species 1967 (IMA1966-034)
CLASSIFICATION 
Dana
(8th edition) :
25.03.01.01  
  (25) Anhydrous Borates Containing Hydroxyl or Halogen
  (25.03)
  (25.03.01)
  
Nickel-Strunz
(10th edition) :
06.CA.10
  (06) Borates
  (06.C) Triborates
  (06.CA) Neso-triborates
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 18.428 Å, b = 9.882 Å, c = 6.326 Å, b = 104.387°
Crystal Habit: Crystals elongated, flattened, small
  
Color: Colorless
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 2.5
Measured Density: 2.03 g/cm3
Cleavage: 3; {100}good, {010} and {001} poor
Tenacity: Brittle
Fracture: Conchoidal
Streak: White
  
Geologic Setting: Formed in massive borax in a borate-rich playa
Mineral Association: Tincalconite, borax, ezcurrite, rivadavite
  
Luminescent Properties: Pale blue fluorescence and phosphorescence under SW and LW UV.
Other Properties: H2O Soluble.

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