Moonstone is a stone of fertility and femininity. The slopes are in India, the US, Brazil, and Madagascar, but mostly in India. The horoscope is intended for Cancer, Pisces, and Capricorn.

more information in an article about lunar stones
 

The Moonstone is not so exciting in the raw state and is getting its beauty through the grinding to the shape of a muggle. Only then a mysterious glitter excels and is professionally called as an adularescence. The cause is the breaking of light rays, which are further scattered in stone.
Mostly is used for beautiful jewels of moonstone