What is the most durable rock on earth?
<p>Without a doubt, the title holder for “<em>World’s Toughest Rock</em>” (not a mineral, but a rock) has to go to Banded Iron Formation, or at least to a related variety of ironstone (there are several).</p>
<p>Anyone who’s ever dealt with Banded Iron Formation, which we usually refer to as BIF, knows that it’s a beautiful rock that is also an absolutely gnarly bitch to break or cut. The reason is pretty simple: it is composed of alternating layers (bands) of quartz, which is already a pretty hard material, and hematite. Hematite is Fe2O3. It is hard. It is iron. It is not your friend if you’re trying to do anything with it.</p>
<p><a href="https://craigmcclarren.medium.com/what-is-the-most-durable-rock-on-earth-8d9ec8578bad"><strong>Read More</strong></a></p>