Moon’s light:
All the crystals adore the moonlight, especially during the full moon period.
The powerful energy of the full moon actually lasts for 3 days, thus giving enough time to clean all the desired crystals, the day before the full moon, during the full moon and the day after the full moon.
Crystals will capture the energy they need even if it’s raining outside or cloudy. If it still rains, be careful not to be touched by water. (Crystals that need to avoid water here).
Sunlight:
Many crystals like to bathe in the sunlight, especially red, orange or yellow (like Carneal and Stone of the Sun).
Crystals can be left in the sun for a few hours for cleaning and energizing.
Take great care with crystals placed in the sun, some crystals turn off their color or even change them.
Usually, there are crystals that are pigmented, such as the Amethyst or Florina.
Preferably do sunbathe only when it is certain that the crystal is compatible with sunlight.
Avoid sunlight:
These crystals should avoid exposure to sunlight for long periods of time.
The list includes many of the common crystals; is not complete but provides a good start in understanding which crystals should avoid sunlight for long-lasting exposures.
Aquamarine, Amethyst, Ametrine, Green Apophilite, Celestite, Citrine, Smoky Quartz, Pink Quartz, Florin, Hidenite, Kunzit, Opal (Dry), Prasiolit, Topaz, Turquoise.
In water:
A bathing in cold water is very refreshing for most crystals.
It can be running water or non-running water.
It is important to remember that the water is cold, crystals do not like hot water.
It is an easy, quick way and can be done anytime and anywhere.
While the crystals are immersed in water, they see how the water cleans them from all negative energies.
The water will clean them both physically and energetically. Water cleaning is the handiest method when it comes to cleaning the crystals in a bracelet, for example.
Keep in mind that there are certain crystals that are not cleaned in water.
As a general rule, it is advisable not to submerge the crystals with a Mohs hardness equal to or less than 5.
Also, if it is desired to keep a crystal for a longer period, it is good to make sure that the crystals do not contain iron because they can oxidize (crystals such as the Hematite, Magnetite, etc.).
Saltwater:
It’s another way to clean the crystals but require extra care.
Many crystals can be damaged by salt. Crystals with a Mohs hardness of 7 or more can be washed in salt water.
It is preferable to use intuition and to the least doubt not clean with salt water.
Avoid water:
These crystals should completely avoid exposure to water.
Water may damage the crystal or even disintegrate and dissolve it.
The list is not complete but it provides a good start in understanding which crystals should avoid contact with water of any kind. Halit, Malachite, Himalayan Salt, Selenite, Desert Rose.