piano scale
G natural minor
G1A2B♭♭3C4D5E♭♭6F♭7
The major scale started from its sixth degree: same seven notes, a different centre of gravity.
Written out
Every accidental is written in, rather than left to a key signature, so the letters can be read one at a time.
The step pattern
GWAHB♭WCWDHE♭WFWG
What is true of it
G natural minor is G, A, B♭, C, D, E♭ and F, and back to G.
Its steps are W – H – W – W – H – W – W, where W is a whole step and H a half.
On the same tonic, G harmonic minor differs from it by exactly one note.
Chords made only of these notes
Found by testing every chord in the catalogue against these 7 sounds, not chosen.