Geodes, for instance, are created when mineral-rich water seeps into hollow spaces within rock formations and slowly evaporates, leaving behind dazzling crystals like quartz and amethyst.

The hills along the Pennsylvania-Maryland border contain fractured basalt rock that allows quartz-bearing solutions to crystallize in cracks, forming amethyst vugs and geodes. These vibrant purple ...

In the northern region of Brazil, enormous amethyst quartz waste is generated in mining, currently with no final destination, being stored without commercial value. However, it can be used to produce ...

Colorless synthetic quartz that shows obvious Brazil-law twinning has been grown over a seed plate of natural amethyst that is twinned according to the Brazil law. Although commercially available ...