A minor chord is composed using a root/1st, minor 3rd and perfect 5th (or R/1-♭3-5) intervals played simultaneously. Generally written as Cmi, CMI or C-, it is good practice to simply use an upper case C and a lower case mi (Cmi) to represent it in writing.
In guitar, the intervals of a minor chord may not always be played in tonal order (root/1st, minor 3rd, perfect 5th, in this order) however the root note will always be the lowest tone (and most distinct) unless it is an inversion. For example: a Cmi chord played on the 8th fret using voicing #4 (barre chord) has a interval sequence of: root/1st, perfect 5th, root 1st(octave), minor 3rd, perfect 5th and root/1st(x2 octave) or R/1-5-1-♭3-5-1.
The tonality of a minor chord is consonant and resolved, though it is considerably "darker" than a major chord. It does not "lead away" from itself like the dominant seventh chord, or leave the listener with a sense of "suspense" like the minor seventh flat five chord.
Major, minor and diminished triads occur naturally in the harmonized major scale (triads), an augmented triad is simply a major triad with a raised fifth degree.
Minor chord profile
|Intervals||root/1st, minor 3rd, perfect 5th or R/1-♭3-5|
|Common names (examples in C)||Cmi, Cmin, CMIN, CMI, C−|
Minor chord table
|Chord name||Root||Minor third||Perfect fifth|
|C Minor chord voicing #2|
External related resources¹