A natural minor scale is a seven note scale. Another way to think of a natural minor scale is simply a major scale started on the sixth degree and finished on the sixth an octave above.
Major Degrees: 1-2-b3-4-5-b6-b7 or I-II-bIII-IV-V-#V-bVII
Stepping: whole - half - whole - whole - half - whole - whole or W-H-W-W-H-W-W
Tonal: tone / semi-tone / tone / tone / semi-tone / tone / tone or 2-1-2-2-1-2-2
Commonly used in: Jazz, Rock, Metal,...
Also known As: natural minor scale, Aeolian mode of the major scale