Find out about the scale that measures how hard tourmaline is, and reveal its attractive features. Be ready to know about everything on tourmaline hardness. Skip to content ...

Mineral Monday is a weekly video series exploring the many amazing minerals, fossils, and historic objects on display at the W.M. Keck Earth Science and Mineral Engineering Museum as told by museum ...

Map of the U.S. featuring general hardness of the aggregate in that geographical location. Areas in red (California, Arizona, etc.) are granite, slate, traprock, basalt and quartzite.

But Sharygin explained that the Mohs scale has a wide range between 9 and 10. All mononitrides fall at this end of the scale, he said, "but their hardness is lower than [that of] a diamond." ...