That is interesting, I hovered my mouse pointer over the buy it now button for just a bit to see what it felt like
. I got the cold sweats! lol my hd600 will have to suffice
Seeing as one of, if not the most abundant mineral on earth's surface is silica (base of quartz), i cant imagine that piece of quartz (SiO2) is too rare or worth $700... Those large intact crystal forms are the only thing he's got going there.