Formula: NaB3O3(OH)4
Origin of name: For Argentine geologists, F. and C. Ameghino
Crystal system: Monoclinic
Crystal class: 2/m
Unit cell: a = 18.428 Å, b = 9.882 Å, c = 6.326 Å, b = 104.387°
Colour: Colourless
Diaphaneity: Transparent
Habit: Crystals elongated, flattened, small
Hardness: 2.5
Specific gravity: 2.03
Cleavage: 3; {100}good, {010} and {001} poor
Streak: White
Synonyms/varieties:
Comments: Fluoresces strong pale blue; also phosphorescence
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