I'll use "A" as the home tone.
A Natural Minor - A, B, C, D, E, F, G, A (Same up and down)
A Melodic Minor - A, B, C, D, E, F#, G#, A, G, F, E, D, C, B, A (Up, the scale is similar to a Major Scale, but with a Minor Third. Down, it's a Natural Minor Scale)
A Harmonic Minor - A, B, C, D, E, F, G#, A (Same up and down. Augmented 2nd interval between the 6th and 7th scale steps)
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There are also the Minor Modes:
A Dorian - A, B, C, D, E, F#, G, A (Same up and down)
A Aeolian - A, B, C, D, E, F, G, A (Same as a Natural Minor. Same up and down)
A Phrygian - A, Bb, C, D, E, F, G, A (Same up and down)
A Locrian - A, Bb, C, D, Eb, F, G, A (Same up and down. This Scale is usually in the Diminished Catagory)
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A Minor Pentatonic - A, C, D, E, G, A (Same up and down)
Lots of different Minor Pentatonics (Japanese, Korean, etc.)
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A Jazz Minor - A, B, C, D, E, F#, G#, A, G#, F#, E, D, C, B, A (Same up an down)
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Any scale with a Minor Third interval between the Root and Third.
Some of the Modes of the Melodic Minor Scale:
The Sixth Mode of a C Melodic Minor - A, B, C, D, Eb, F, G, A, G, F, Eb, D, C, B, A (start with the 6th Step of an ascending C Melodic Minor Scale). Sometimes called the Locrian #2 Scale.
The Seventh Mode of a Bb Melodic Minor - A, Bb, C, Db, Eb, F, G, A, G, F, Eb, Db, C, Bb, A (start with the 7th Step of an ascending Bb Melodic Minor Scale). Sometimes called the Altered Scale.
Some of the Modes of the Harmonic Minor Scale (i.e., A Dorian #4 - A, B, C, D#, E, F#, G, A, G, F#, E, D#, C, B, A).
Lots more...
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(I hope I spelled these right... lots of them!)