Minerals like quartz can go in the sunlight but since lepidolite is a mica stone you might consider taking it out in the sun. It has got many-layered structures which are sensitive to sunlight exposure. The crystal’s layers get shackled once exposed to the sun. The change may not be visible but it’s obvious and can be experienced in your daily life. It starts losing its overwhelming powers of changing a person’s mood and becomes a rather odd-looking stone by losing its colour also.