Coral Mineral, Gemstone Geology, Properties, Formation

Coral is skeletal material produced by marine animals. Coral is organic and created by living organisms. The hardened skeleton remains and this material is used as a gemstone.

Rock and Gem (Paperback) Books Inc. - The West's Oldest Independent Bookseller

Aragonite Properties, Facts and Photos

Minerals, Free Full-Text

Geology Word of the Week: L is for Luster - Georneys - AGU Blogosphere

Olivine: A rock-forming mineral. Used as the gemstone peridot.

Red Coral Gems: Healing Properties & Uses

Amber - Types,Formation,Sources,Properties,Test,Value

Gemstone Color & Meanings--Your Ultimate Guide - Q Evon

Rose Quartz Healing Properties, Facts and Photos