Moonstone

Chemical Formula

Plagioclase Feldspars: (Na,Ca)Al_1-2Si_3-2O₈
Orthoclase Feldspar: KAlSi₃O₈

Color

White, Colorless, Blue, Green, Yellow, Orange, Brown, Pink, Purple, Gray

Hardness

6 - 6.5

Crystal System

Click here for information on the Crystallization of Feldspar Minerals.

Refractive Index

1.518 - 1.526

SG

2.56 - 2.62

Transparency

Transparent to translucent

Double Refraction

-.0005

Luster

Pearly

Cleavage

2,1 - basal ; 2,1 - prismatic ; 3,1 - pinacoidal

Mineral Class

Orthoclase, Oligoclase, and other members of the feldspar group