What is a good stone to use to clear old or negative energy in a workspace or office? Also what is a good stone to protect or convert negative energy into positive?
Thank you for your inquiry. To clear out stagnant energy from a room or office you can try gridding it with a combination of Clear Quartz and Smoky Quartz and/or Amethyst, both of which are good for transmuting negative energy into positive energy. Here is an article with more information on gridding:
Two great crystals for protection against negative energy are Black Tourmaline and Black Obsidian.
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I must share the standard disclaimer that I am not a doctor and cannot give out medical advice. Crystals for healing should be used as a complement to other therapies and not as a replacement for regular medical care. The information offered here is based on a combination of my own personal experiences and that of others on using crystals for healing. My hope is that you will let your own intuition guide your path in working with crystals as well.