The invention relates to a two-component mixing capsule (1) for receiving and mixing two preferably powdery or preferably pasty or kneadable compounds, particularly preferably dental compounds, said mixing capsule comprising a capsule housing (2) that has a discharge spout (3) at its front end (2.1). Said mixing capsule (1) comprises a first mixing space (5a) and a second mixing space (5b) that can be separated from each other for storage or for transport, due to the first mixing space (5a) being rotatable into a first position by a rotatably mounted rotating element that has an axis of rotation (Y) arranged approximately perpendicularly to the longitudinal axis (Z) of the mixing capsule (1). The first mixing space (5a) is separated from the mixing space (5b) in said first position, the central axes of the mixing spaces being preferably arranged at approximately 90° to each other. By rotation of the first mixing space (5a) into a second position, in which the central axes of the first and second mixing spaces are arranged substantially coaxially, the two mixing spaces form one common mixing space (5a + 5b). By attaching an ejection piston, the compound can be expelled after the mixing operation.