sorry Adele, was rushing to get back to the link to do some reading.
crystals have a vibration - we can tap into that vibration and use it for healing purposes.
Modern life is too fast a vibration for us, we havent evolved quickly enough to keep up, and that could be why we have so much stress and burnout now.
Using crystals helps our vibration work at the correct level (speed?) and after a crystal healing session we are more alert, more aware, more focused.
By wearing crystals, or having them around the house, helps to maintain this for longer.
but crystals need to be energised, almost like a rechargeable battery, which is simply done, by allowing it to absorb sunlight and moonlight, cleansing it with flowing water or smoke to disperse any negative energy that it has absorbed. Thus re-energising it and starting with a clean slate.
I am still learning this, like anything, it is such a huge subject and you constantly learn new things.
Think about quartz, a crystal. what is it used for? clocks, computers, etc.
Now, somebody else who works with crystals may look at it with a different perspective, they may use crystals to meditate with, to make solarised water or gem elixirs.
Crystals throughout history have been used to display wealth (have you got an engagement ring or eternity ring on?) and symbolise different things/meanings. Apparently some healing places and religious buildings have crushed crystals into the mortar. if I ever build a house or a wall, I will do this!