Hi MoonGoddess
Crystals and chakras hmmm.
I read your lovely rune chakra piece and meant to reply there. I will reread and do so.
Working as a crystal healer I usually use 10 chakras not just the main 7. So I will tell you about all ten and what I feel. Like you say, this isn't written in stone, there are many more stones that can be used for each chakra and some are more popular than others, some easier to get hold of, or safer. This is simply a starting point. Going by the colours is a great way of doing a chakra workout, using all the same crystal, for instance calcite or aventurine is almost guranteed to give a really gentle and harmonious balance.
Soul Star - sometimes called Higher Crown - above the head - Clear Quartz, Lemurian Seed Crystals, clear stones
Crown - top of the head - Amethyst, Kyanite, Mystic Flourite, Charoite - Violet - White
Third Eye - brow - between eyes - Sodalite, Lapiz Lazuli, - Indigo
Throat - adams apple, throat area - Blue Lace Agate, Dumortierite, Turquoise - Blue
Higher Heart - above heart - Rose Quartz - Rhodochrosite - Pink
Heart - Heart area - Green Aventurine - Malachite - Amazonite - Green Flourite - Green
Solar Plexus - middle of breastbone - Citrine - Yellow topaz, Sunstone, Tigers Eye - Yellow
Sacral - beneath belly button - Carnelian, Agate, Sardonyx - Orange
Root - Base - base of spine - Red Jasper, Hematite, Onyx - Red through to earthy brown then black
Soul - Earth - Under the feet - Hematite, Black Obsidian, Boji Stones - Browny earthy and black
If doing any chakra work always start adding from the bottom so the energy builds from the base upwards and then when finished, removing from the top so that the energy then grounds back down at the end.