en.wikipedia.org: Mineral - Wikipedia, The Free Encyclopedia
A mineral is a naturally occurring solid chemical substance that is formed through geological processes and that has a characteristic chemical composition, a highly ...
rocksandminerals4u.com: Rocks, Minerals And Crystals For Earth Science Fun
Information, activities, and lesson plans on rocks, minerals, and crystals designed for students and teachers.
Keywords: crystals , rocks and minerals
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