Sodium ammonium sulfate

Formula: NH₄NaSO₄·2H₂O.

Artificial analog of the mineral lecontite.

Properties

• Crystal system: orthorhombic
• Crystal shape: compact
• Color: colorless
• Stability on air: stable

Preparation

Mix equimolar amounts of sodium sulfate Na₂SO₄ and ammonium sulfate (NH₄)₂SO₄, dissolve them in water and crystallize. Sometimes it is used as fertilizer and can be purchased ready.

Growing

Grows fast, but easily forms opaque inclusions. Probably, these inclusions are caused by room temerature changes.

Safety

Safe.

More photos

References

• Mindat: Lecontite