This picture shows the difference in the intensity and size of our electro-magnetic field even a small quartz crystal can make.
Holding a small double terminated quartz crystal (a point at both ends), was shown to double the photographable part of the aura.
The Kirlian camera uses electron cascades to make the electro-magnetic fields that surrounds us visible, in a similar way that iron filings can make magnetic fields around magnets visible. Increasing aura size is significant to those wanting to develop psychically, as like anything else, expanding our senses requires energy and not any energy will do.
A plate of fries certainly contains a great deal of energy in the form of carbs, but we also need that energy which feeds our subtle bodies, and the Kirlian photographs show this is just what quartz crystals do.