Rivadavite

Formula: Na6Mg[B6O7(OH)6]4.10H2O

Origin of name: for B. Rivadavia, President of Argentina

 

Crystal system: monoclinic

Crystal class: 2/m

Twinning:

Unit cell: 

 

Colour: colourless

Diaphaneity: transparent

Luster: vitreous

Habit: crystals prismatic, elongated along b-axis, to 3 cm, nodular masses

Hardness: 3.5

Specific gravity: 1.91

Cleavage: 3; {100} and {-101} excellent, {010} poor

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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