Witch Finger Quartz cluster approx. 1.75". Although not a pretty crystal, they are by far one of the most powerful.
Witches / Witch's finger quartz is a combination of Quartz with Rutile and encrusted with any combination of Mica, Muscovite, Magnetite, Sphalerite, Feldspar,  Hematite, Zinnwaldite, and Actinolite.
These crystals are fairly rare as they were mined in Zambia and the mine is now closed
 
Metaphysically, Witch Finger Quartz guards against chaotic energy; they protect their caregivers.
meditating with this crystal will help bring you the teachers and guides needed to aid you in fulfilling your purpose; brings spiritual growth, personal growth; opens intuition\ channeling; excellent for use in crystal healing grids