Crystal Cleansing and Programming
Most Crystals absorb negative energy from around them and tradition has it that before using a crystal for healing or meditation it should be cleansed and programmed for the intended use.
Running water
Crystals which are non friable, not soluble in water, or jointed can be held under running water or immersed in sea or salt water. as you do so, you should hold the intention that all negativity will be washed away the crystal re-energised.
Placing the crystal in the sun or moonlight can recharge it also. take care not to start a fire with crystals placed in the sun which can act in the same way as a magnifying glass in sunlight.
Salt
Friable crystals or clusters can be left in sea or rock salt overnight. Take care to brush off all the salt to avoid damage.
Smudging
You can cleanse crystals using smudging by passing them through the light from a candle or through herbal incense smoke.
Visualisation
A lot of cleansing, programming, meditation and healing involves visualisation and you can cleanse your crystals by visualising them surrounded by light which cleanses and re-energises them.
Crystals which Cleanse
Some Crystals do not require cleansing:
Citrine, Kyanite and azeztulite
Some Crystals act as cleansers for others:
Carnelian and clear quartz
If you keep a carnelian with other stones then you will never have to cleanse the others.
You may have to cleanse the carnelian from time to time.
Likewise you can cleanse smaller crystals on a larger cluster of clear quartz.
Programming
After you have cleansed your crystal and re-energised in programming is simply a matter of keeping the crystal with you and visualising it's uses and that it is used only for the highest benefit.