A vast mounted set of 50 rocks and minerals found in the United States. This collection emphasizes incredible variety, and covers the full range of sedimentary, igneous, and metamorphic rocks. Featuring rocks and minerals such as scoria, pyrite, oil shale, sulfur, pyrolusite, jade, calcareous tufa and corundum this comprehensive set boasts both familiar and lesser known specimens. A comprehensive handbook is included, which defines key terms, gives the specific gravity and hardness as well as a brief description for each rock and mineral. An excellent study tool for those with an interest in geology, or a great gift to introduce a loved one to the diversity of US geological formations.
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