This brittle mineral is typically found as an inclusion, like the chocolate chips in another mineral’s cookie dough. Some ...

China hits back at U.S. tariffs by restricting export of crucial metals: tungsten, tellurium, bismuth, molybdenum and indium.

These needle-sharp structures are composed of a transparent, brittle mineral formed from calcium carbonate. They protect the soft bodies of these marine invertebrates, and are key to distinguishing ...