Erasmus's lucky pebble -- What is a gem? -- Most gems are minerals -- Seven crystal systems -- Magma gems -- Water gems -- Living gems -- Imitations and synthetics -- Cultured pearls -- Working with gems -- Then and now.
Summary:
"Investigate Gems introduces readers to what gems are and how they form, including mineral gems and organic gems. Learn about crystal systems, imitation and synthetic gems, cultured pearls, how gems are used, and their historic importance. A geology-themed project provides the opportunity for hands-on experience. Other features include a table of contents, fun facts, infographics, sidebars, map, and an index. Aligned to Common Core Standards and correlated to state standards."
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.