i have to tell you, one day i chose a couple stones to hold in each hand, intuitively chosen. i picked up a 5 inch stibnite blade and a smoky quartz crystal. holding one in each hand, i held them touching eachother and my aura/magnetic field was "switched on". it's pretty powerful. i showed it to others and they feel the same thing. try it if you can. just having them touching on your person makes you feel like an electromagnet. let spirit show you how to use it. <3
i have also been compelled to make a bismuth and quartz pendant prior and that wasn't as strong as this.
i thought there must be iron in the smoky quartz, mimicking the martial regulus. but wikipedia says the color is caused by free silica - irradiated silicon dioxide.