The drug is obtained from various alunites.
Irregular crystals, different in size.
Colorless, semi - transparent or completely transparent.
The surface is smooth or slightly uneven and glazed.
Hard and brittle consistency, easily breakable.
Weak smell and sour taste.
The drug is soluble in water and glycine soluble, but insoluble in alcohol.
Alunite: KAl3 (SO4) 2 (OH) 6, of which 11.4% K2O, 37% Al2O3, 38.6% SO3, 13% H2O.