a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones
source: WordNet 3.0
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.
source: Webster 1913
Bleached yarn in making the linen tape called inkle; unwrought inkle.
