u/Dreamfield79

Sometimes called the “Tempest Stone,” pietersite is one of the rarer members of the quartz family — made up of hawk’s eye and tiger’s eye found in only two places on Earth: Namibia and a small region of China. The swirling storm of black, gold, and amber isn’t a surface treatment — it’s the natural result of ancient tectonic forces fracturing and re-cementing the fibrous minerals over millions of years.

I inherited this piece among with a few other elestial quartz pieces from a friend of mine. This one really stood out for its forms and shape reminiscent of a scaled wing.
It is understood that the growth lines are interruptions in the crystal’s growth due to changes in the subterranean conditions. The time between each growth line could span from thousands to millions of years.
Not too sure where this could be from though…Brazil, Madagascar?