Yes there is.
Play this little line.
C (8th fret, low E)
F (8th fret, A)
G (10th fret, A)
A (5th fret, low E)
D (5th fret, A)
E (7th fret, A)
B (7th fret, low E)
Get used to it.
Right, now the first three notes are MAJOR. In the key of C the C, F and G chords are Major.
The next three are MINOR. In the key of C the A, D and E are Minor.
The last note, B. That's DIMINISHED.