Other
Icga: Agate, Stripe Up the Bands
An interesting, brief discussion of the gem and mineral agate, including its physical properties and historical uses.
Wikimedia
Wikipedia: Aquamarine and Maxixe
Article on the mineral beryl with a section on aquamarine, which is a variety of beryl.
Other
Gem Hut: Garnet
This commercial site gives information about garnet, including some of the varieties and where they are found. It also has pictures.
Other
Gem Hut: Moonstone Gemstones
This commercial site gives a brief description of moonstone with pictures of finished stones.
Curated OER
The Mineral Gallery: Amethyst
A detailed description of amethyst, including its physical properties and the more noteworthy locations it is mined.
Curated OER
The Mineral Gallery: Aquamarine
This site has some background information on aquamarine, a blue form of beryl. Provides details about variety, uses, color, and more. Detailed and helpful information.
Curated OER
The Mineral Gallery: Emerald
A brief physical description of emeralds from an online database about minerals. Provides information about history, characteristics, color, and use.
Curated OER
Amethyst Galleries: Jade
This site gives a basic description and information on jade. Provides information about uses, color, hardness, and history.
Curated OER
The Amethyst Gallery: Peridot
This brief article has information on the physical characteristics of peridot and where it is found. Includes information about color, uses, and hardness, and provides pictures of the gem.