MOONSTONE


All facts and figures taken from the GIA

MOONSTONE

A ghostly sheen moves under the surface of this feldspar, like moonlight glowing in water. Moonstone is a variety of the feldspar-group mineral orthoclase. During formation, orthoclase and albite separate into alternating layers. When light falls between these thin layers it is scattered producing the phenomenon called adularescence. Adularescence is the light that appears to billow across a gem. Other feldspar minerals can also show adularescence including labradorite and sanidine.


MINERAL: Feldspar
CHEMISTRY: KAlSi3O8
COLOR: Colorless to White, Gray, Green, Peach, Brown
REFRACTIVE INDEX: 1.518 to 1.526
BIREFRINGENCE: 0.05 to 0.008
SPECIFIC GRAVITY: 2.58
MOHS HARDNESS: 6.0 to 6.5


Moonstone is a birthstone for June, along with pearl and alexandrite.

FOUND WHERE

Precious_Gemstone_Where_Found_Moonstone