Well, lets start with a favorite of mine - Amethyst. I will make this brief and clear:
Color: Pale lilac to deep purple.
?Associated Crystals: Jade, moonstone and rose quartz.
?Candle Color: Dark blue or purple.
?Flowers & Plants: Lavender, lilac and violet.
?Herbs - Incenses - Oils: Chamomile, lavender, patchouli and sweetgrass.
Metaphysical Properties & Uses:
?Animals: Use amethyst water to help calm hyperactive pets and to stop excessive barking in dogs. It will also help to deter fleas and ticks.
?Children: Amethyst (ideally a geode) should be used to help children who suffer from nightmares.
?Environment: Amethyst should be set in the ground in polluted areas.
?Finance & Prosperity: -
?Health & Healing: Amethyst is a general all-round healer and is excellent for distance healing.
?Home: Any dark or negative areas of your house should have an amethyst placed there. It will also help to soothe anger and impatience.
?Protection: It is protective against dark energy and should be placed in any part of the house (or wherever) that feels negative. Amethyst is also protective against technological pollution wherever it occurs.
?Psychic: Use amethyst to enhance psychic dreams.
?Work: It will help soothe anger and impatience and prevent you from becoming anxious.
?Other: Amethyst will help cleanse and charge any crystals that have been used for divination, healing or protection.
If you have anything to add, feel free to.