These seconds can be major or minor, diminished is not normally used because it sounds like a unison and the augmented gives the sound of a third. Chords built from seconds do not have traditional names, such as those built with thirds. These chords are often called chord clusters. These thirds can be diminished, major, or minor. See above for the common spellings of these chords and their common names.
Quartal harmony is based upon chords constructed with stacked fourths.
These fourths can be diminished, perfect, or augmented. Chords built from fourths do not have traditional names, such as those built with thirds. These fifths can be diminished, perfect, or augmented. Chords built from fifths do not have traditional names, such as those built with thirds.