Ocurrance:
Sri Lanka (Ceylon), Myanmar
(Burma), Madagascar, Germany, India, Tanzania, Brazil, United States, Mexico.
Appearance:
Moonstone is opalescent,
with a blue or white scheen, sometimes called "schiller", resembling moonshine.
Composed of albite and orthoclase feldspar, the albite gives it the bluish
color.
Something
Extra:
Fine moonstone is quite
rare and becoming rarer.
Moonstone almost seems
magical with a ghostly shimmering glow floating in a crystalline material.
The Romans thought that
moonstone was formed out of moonlight. Moonstone is a variety of
feldspar and the shimmer,
which is called schiller or adularescence, is caused by the intergrowth
of
two different types of
feldspar, with different refractive indexes.