It is a white solid, in contrast to copper(II) sulfate, which is blue in hydrous form.
Compared to the commonly available reagent, copper(II) sulfate, copper(I) sulfate is unstable and not readily available.
[1] Cu2SO4 crystallizes in the orthorhombic space group Fddd.
[1] Cuprous sulfate is produced by the reaction of copper metal with sulfuric acid at 200 °C:[3] Cu2SO4 can also be synthesized by the action of dimethyl sulfate on cuprous oxide:[4] The material is stable in dry air at room temperature but decomposes rapidly in presence of moisture or upon heating.
It decomposes into copper(II) sulfate pentahydrate upon contact with water.