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• n  a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones

• Be warned: your preconceptions about a joyless Islam may be shattered by the inscribed royal spinel (all 249.
• Be warned: your preconceptions about a joyless Islam may be shattered by the inscribed royal spinel (all 249.

News & Articles

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• Researchers develop harder ceramic for armor windows
  The Department of Defense needs materials for armor windows that provide essential protection for both personnel and equipment while still having a high degree of transparency. To meet that need, scientists have developed a method to fabricate nanocrystalline spinel that is 50 percent harder than the current spinel armor materials used in military vehicles.
  April 30, 2014 - Science Daily