Quartzite, however, is a metamorphic rock formed from sandstone that has been exposed to intense heat and pressure. It shares the same properties as many other natural stones, like being porous.

Read more: Countertop Choices That Are Making It Harder For You To Sell Your House Leathered quartzite's rough texture protects the surface from minor scratches and smudges, ensuring the ...

We're after pure gold, but rock that contains gold also includes lots of other materials such as quartz, calcite, and the sulfides of other metals. Since we need to separate the gold from the rest ...