SPINELLE
\spˈa͡ɪnə͡l], \spˈaɪnəl], \s_p_ˈaɪ_n_əl]\
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A mineral occuring in octahedrons of great hardness and various colors, as red, green, blue, brown, and black, the red variety being the gem spinel ruby. It consist essentially of alumina and magnesia, but commonly contains iron and sometimes also chromium.
By Oddity Software
