society > occupation and work > materials > raw material > gem or precious stone > feldspars > [noun] (4)
Any of various precious stones typically showing red or golden-yellow internal reflections; spec.: †(a) a form of quartz; = cat's-eye, n. 2 (obsolete)…
A mineral of the plagioclase feldspar group, typically greyish-white and sometimes showing blue iridescence, which occurs in igneous and…
A mineral; a ‘bright verdigris-green and cleavable’ variety of orthoclase, worn as an amulet by the Indians of the Rio Negro.
Labradorite, or a variety of this.