Spinel, MgAl 2 O 4 (download cif), is a rare gemstone that was used to imitate rubies. The structure has face-centered cubic symmetry, and is a little heavy to understand. The general formula is AB 2 ...

This story may make you go from green to red. If you were born in the month of August, you are most likely a Leo or (for those born after August 23), a Virgo. You have also been long accustomed to ...

TOURISM of rare spinel gemstones has continued to gain worldwide popularity in Mahenge, an area located in the Morogoro region, Ulanga District, which now places the area on the map of mineral tourism ...