Copper-Magnesium Schoenite

October 2019

Keywords: copper, magnesium, schoenite, sulfate

A mixed compound, solid solution of 2 different Tutton's salts: potassium-copper and potassium-magnesium. Approximate formula: K₂(Mg_0.5Cu_0.5)(SO₄)₂·6H₂O

Properties

Crystal system: monoclinic
Crystal shape: flat slant prisms with rhombic base, very different from the shape of pure schoenite.
Color: light blue, much lighter than copper sulfate
Stability on air: stable

Preparation

Mix K₂Cu(SO₄)₂·6H₂O and K₂Mg(SO₄)₂·6H₂O approximately in 1:1 ratio, dissolve in water and crystallize.

Safety

Mildly toxic as all copper compounds

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