Ammonioborite

Formula:  (NH₄)₂B₁₀O₁₆^.5H₂O

Origin of name:  From composition

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 25.27 Å, b = 9.65 Å, c = 11.56 Å, b = 94.287°

Colour:  White

Diaphaneity: Translucent

Luster:

Habit:  Crystals microscopic, platy grouped in parallel position; compact and fine-grained granular masses

Hardness:

Specific gravity:  1.77

Cleavage:  None

Tenacity:

Streak:

Synonyms/varieties:

Comments:  Soluble in water