Amethyst:
Encourages selflessness and spiritual wisdom
Excellent stone for meditation and scrying
Helps with dream recall
Protects against Psychic attacks 
Best Crystal Pairings:
Smoky Quartz, Hematite, Tiger Eye, Rainbow Fluorite
Correlating Zodiac Placements:
Aquarius, Pisces, Aries, Sagittarius
**You do not need to have these placements in your astrological chart to work with the crystal, it will just have a stronger effect for said placements!**