“I believe that all crystals are inherently safe but many have a very powerful vibration and if you’re very sensitive, they might make you feel a range of symptoms (light-headedness, dizziness) until you get accustomed to their vibration. Also remember that any black stones are absorbers. So, if you are carrying them around in your pocket or wearing them, be prepared to absorb a lot of other people’s energy.”
Are Crystals Safe?
“I believe that all crystals are inherently safe but many have a very powerful vibration and if you’re very sensitive, they might make you feel a range of symptoms (light-headedness, dizziness) until you get accustomed to their vibration. Also remember that any black stones are absorbers. So, if you are carrying them around in your pocket or wearing them, be prepared to absorb a lot of other people’s energy.”
Twelve of Hearts Divination Blog 
Could you post a link to the thread from the Spiritual Inspiration Forum?
Thanks for writing about this.
Mary
Hi Mary,
Found the link: http://www.spiritualinspiration.org/t1767-negative-crystals