adularescence

from The Century Dictionary.

• noun The chatoyancy of the adularia variety of feldspar; the moon-like sheen of the moonstone, best visible when the stone is cut with a convex dome.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A phenomena, exhibited by some specimens of the mineral adularia, exhibiting a bluish sheen along crystal faces. Adularia with this property is called moonstone. (See sanidine).