Aristarainite

Formula:  Na₂MgB₁₂O₂₀ ^. 8H₂O

Origin of name:  For Lorenzo Aristarain, Argentinean mineralogist

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 18.886 Å, b = 7.521 Å, c = 7.815 Å, b = 97.72°

Colour:  Colourless

Diaphaneity: Transparent

Luster:  Vitreous

Habit:  Prismatic well-formed crystals, elongated or tabular; rosette-like aggregates

Hardness:  3.5

Specific gravity:  2.03

Cleavage:  3; {001} and {100} perfect, {110} fair

Tenacity:

Streak: White

Synonyms/varieties:

Comments: