It depends on what you want to use the crystal for. for example the energy of a full moon would be very diffrent from sun energy. And the energy from a rising sun or moon would be diffrent from the energy of a setting sun or moon.
you can also charge up the crystal with other kinds of energy. ive charged up a crystal with sexual energy before. Thats a lot of fun, not only the part of charging it up, since that took sevral sex sessions to do it. After i had the crystal charged up i gave it to a strait male frend of mine, it had a hole drilled in it so i put a leather thong thru it and made it into a real rough masculine looking bracelet and gave it to him. it wasnt half an hour before he was feeling all hot and bothered and horny, so naturaly i had to volunteer to help with scraching that itch of his.
He was fine with it, its not like it turned him gay or anything like that. Hes still a strait guy, loves his girlfriend. Its almost as if the energy of the crystal, the male on male sex energy just took him over for awhile, made him real incredibly horny but also opened him up to exploring the idea of having a male buddy help him take care of busness. Yeah, that part was REAL fun.
After ward he was fine, he wasnt angry or anything, just a little confused about why he got so powerfuly horny like that. He aint never done nothin else with me since then. It looks like all the energy of the crystal got drained in that one encounter, it was fully discharged so to speak. So i guess sometime im gonna have to charge up another crystal for him.