Geology
- 203
- Gemstone Forecaster Newsletters
- Analyzes Burma ruby and sapphire gems and collector gemstone markets.
- 204
- Gemstones and Collector Stones
- A collection of images and other information about gemstones, collector stones and the minerals with which they are associated.
- 205
- Jade Hunt
- Provides information on jade including nephrite, jadeite, color, types and Chinese jade.
- 206
- National Gemstone
- Introduction to collecting and investing in gemstones and colored diamonds, with descriptions of the types most widely traded.
- 208
- Smithsonian Gem & Mineral Collection
- Pictures and short descriptions of gems and minerals on display at the Smithsonian.
- 209
- The Gemhunter
- A guide to finding gemstones and gold using geological principles. Many such discoveries have been made by Dan Hausel of Arizona, who set up this site.
- 210
- The Image
- Mineral and gemstone galleries. Physical properties and historical facts for minerals and gemstones.
- 212
- Northwest Obsidian Research Lab
- Offers a variety of analytical services related to obsidian trace element characterization ("sourcing") studies, obsidian hydration studies, and obsidian source studies, primarily in the context of archaeological research.
- 213
- NATI Research Ltd.
- About mineralogy of noble metals and highly sensitive techniques for measuring mineralogy of noble metals: metrological maintenance, "ppm-mineralogy" techniques, platinum group minerals and gold in rocks, ores, benefaction products and waste tailings.
- 214
- Reed Laboratories
- Assayer services for gold, silver, and other metals, primarily for mineral prospecting and exploration.
- 215
- Boggy Creek Collection of Meteorite Finds
- Promotes the sale, collection, trading and auction of meteorite samples. Includes analytical data.
- 216
- Lunar Meteorites
- Focuses on meteorites and meteoroids that came from the moon, including how they get here, how their source is determined, types, chemistry, catalog of all verified finds, and other resources.
- 217
- Meteorite
- Information from Wikipedia on these objects originating from outer space that have survived an impact with the Earth's surface.
- 218
- Meteorite Central
- General information on meteorites, meteroids, and related topics; glossary; current news; and links to science sites, dealers, and educational sites.