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1st and 7th chakra.  I like using this stone not only for its grounding effect, but also for the way it pushes us to explore our inner selves more deeply.  It allows us to see ourselves very clearly, and offers information on how we can improve our lives for the better. The Quartz seems to amplify the effect of the Marcasite, very powerful and healing.  From my collection.  1992.

Quartz Crystal with Marcasite Inclusions