Before you use any of the crystals, I am going to suggest you clean them and then charge them.
An easy way to do clean is by using sound. Here is a link to a video where tones from a piano will clear crystals through your computer speaker.
You can also clear crystals by putting them out in sunlight and moonlight for the cleansing and recharging. If this is not possible I would sage them to clear them. Or put them around a salt lamp for a week to be cleaned. An alternate to sunlight and moonlight would be to put them on a copper plate or under a copper pyramid to charge. For more information on how to clean crystals please use this link.
To activate the crystal once it has been cleaned, you can hold it in your hands. While holding it imagine white light coming through your hands. You can then place it on the third eye and imagine the power of intention enveloping the crystal. Or you can hold it to your heart chakra and imagine the intention flowing from there. I would hold the crystal on either chakra for a couple of minutes. When you are done, I would drink some water and wash your hands if you are going to activate any more crystals. You wash your hands to release any energy stored up from the previous crystal.
I hope that these recommendations can be of assistance and that crystals grace your journey with love and light.
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*Disclaimer – Crystals are not a medical treatment and should not be used as a replacement for medical care. Please consult your healthcare specialist for your particular needs.