Jewelry Central
Jewelry Central: Moonstone
An article on a commercial site describing the physical characteristics of this gemstone, along with its historical and metaphysical properties.
Internet Encyclopedia of Philosophy
Internet Encyclopedia of Philosophy: German Idealism
An excellent breakdown of the development of German Idealism. Refers to each of the important thinkers, and their inter-relationships.
Other
Gem Hut: Moonstone Gemstones
This commercial site gives a brief description of moonstone with pictures of finished stones.