According to Dolores Cannon in her book “ In Search for Hidden Sacred Knowledge”
“Red crystal is a healing crystal. It heals the body of the human being and the planet. You can put it on your neck like a necklace.
The blue one bring knowledge.”
If you want to have a big construction or building you go with the white Crystal’s it helps with the construction and with the architect s planning
If you go with yellow Crystal’s it will bring the flourishes to grow the flowers and trees, ll nature.
The purple crystal is the most powerful it bring people to a higher level of spirituality or to evolve to a much higher speed. Very powerful.
The green crystal is used for travelling when you go from place to place for power for speech.