Mineral specimens for the discerning collector (Popularity: ): We specialise in fine mineral specimens from the UK and worlwide locations. Our specimens are hand picked for quality at a realistic price. For collectors or lovers of aesthetic natural ... Minerals of the United States (Popularity: ): Click on the map to view pictures of minerals found in the chosen state. Perlite (Popularity: ): Pictures, links, and a brief description of the properties and applications of this siliceous rock. Rockhounding Arkansas (Popularity: ): An authoritative and comprehensive guide to Arkansas geology, minerals, and the hobby of rockhounding. Written by the well known geologist Mike Howard. Nikolay Gospodinov Collection (Popularity: ): Bilingual Russian and English language site with photos and information on the mineral and fossil collection of Nikolay Gospodinov. Gem Guides Book Company (Popularity: ): Book distributor of books on gems, rockhounding, crystals, mineral collecting, lapidary and jewelrymaking. Luminoscope Corporation (Popularity: ): Manufacturers of the Luminoscope - a cathodoluminescence instrument designed to examine geological samples. Tucson Gem and Mineral Show Guide (Popularity: ): Information and show schedules for the annual Tucson Gem and Mineral Show featuring extensive illustrated reports by Bob Keller. Cape Cod Rocks (Popularity: ): Pictorial museum, exhibiting gems, fossils, rocks, and mineral specimens. Bluechart (Popularity: ): A gem identification chart for $18.