1. Sapphire blue crystals on matrix | ©Webshop for mineral collectors

    Eifel, Rhineland-Palatinate, Germany.

    Sapphire is a blue gem variety of Corundum (an aluminum oxide), but other colored varieties of Corundum are also described as Sapphire, except red Corundum, which is better known as Ruby. 

    Reference: [1]

     
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