Corundum, the crystalline form of aluminium oxide, is the host mineral for the gem varieties ruby and sapphire. Characterization of corundum deposits involves geological classification, mineralogical ...

In this video Derek and I drive all the way up to North Carolina to go hunting for Ruby and Sapphire Corundum crystals at the world famous Propst Farm near Lincolnton, NC. This was my first time ...

This trip starts with a long drive to North Carolina and a simple goal: find ruby and sapphire corundum crystals at Propst Farm. The site is an alluvial deposit, meaning the crystals have eroded out ...

“At the Corundum Hill Mine (near Highlands), various shades of ruby gem corundum have been found,” the U.S. Geological Survey reported in 1906. However, though the gems were similar to the red rubies ...

The Perseverance rover has found precious stones inside Martian pebbles. These gem grains are made of a substance called corundum, which is also known as ruby or sapphire depending on the traces of ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

A 'selfie' taken by the Curiosity rover taken on the Martian surface. Courtesy of NASA/JPL-Caltech/MSS Courtesy of NASA/JPL-Caltech/MSS For decades, Mars has surprised scientists with evidence of ...

LARGE crystals of corundum have been grown for many years by the flame-fusion process originated by Verneuil 1. Crystals coloured by small amounts of chromium, titanium, vanadium and other transition ...