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.

List of 30 Geode Types, Locations, and Usage

Coral - Varieties,Formation,Sources,Properties,Test,Value

Healing Benefits: Rocks, Crystals, and Minerals

142,393 Red Coral Stock Photos Free Royalty-Free Stock, 52% OFF

Calcite - Wikipedia

Minerals, Free Full-Text

Organic Gemstones: Amber, pearl, jet, dinosaur bone and more!

Calcite geology: mineral properties, crystal structure, uses

Rock and Gem: The Definitive Guide to Rocks, Minerals, Gemstones, and Fossils: Bonewitz, Ronald: 9780756633424: : Books

A Mini-Lesson on Rocks and Minerals Woo! Jr. Kids Activities : Children's Publishing