Technical Report
 

A description of some Oregon rocks and minerals

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https://ir.library.oregonstate.edu/concern/technical_reports/6m311p384

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  • Rocks are defined as aggregates or mixtures of minerals; rocks also include noncrystalline materials such as the natural glasses, and organic material such as coal. Rocks are found ready-made in nature. They are not homogeneous nor are they crystalline, although they may be made up of crystalline material. The composition of a rock cannot be expressed by a chemical formula except for a few instances in which rocks are made up of a single mineral, as in the case of limestone.
  • Revised 1986. Reprinted August 2006. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
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