moonstone

[ moon-stohn ]

/ ˈmunˌstoʊn /

Also called precious moonstone. a semitransparent or translucent, opalescent, pearly-blue variety of adularia, used as a gem.

any of several adularescent feldspars, as certain varieties of albite, labradorite, or oligoclase, used as gems.

(not used technically) any milky or girasol stone used as a gem.

Origin of moonstone

First recorded in 1625–35; moon + stone

In a year from the time when the Moonstone was pledged, the Indians will be on the watch for their third chance.

The Moonstone |Wilkie Collins
Howard Archie was "respected" rather than popular in Moonstone.

Song of the Lark |Willa Cather
In what position does the conspiracy to seize the Moonstone now stand?

The Moonstone |Wilkie Collins
Here, then, to begin with, is something which looks suspiciously like an indirect reference to the Moonstone.

The Moonstone |Wilkie Collins

I figure to ride down the Moonstone Trail, steerin' the Guzzuh with one hand and smellin' a bunch of roses in the other.

Overland Red |Henry Herbert Knibbs

moonstone

/ (ˈmuːnˌstəʊn) /

a gem variety of orthoclase or albite that is white and translucent with bluish reflections