Basic unit of 75 rocks and minerals demonstrates the major rock-forming minerals; the scale of hardness; and recognized physical properties. Unit includes 75 number-coded specimens, each size 1 1/4" x 3/4", a streak plate, magnet, magnifier. Packaged in an attractive sturdy box and a compartmented tray for display and study. Also includes an ID Sheet and Introductory Study Guide (with rock classification and rock cycle charts) for instructional use or individual study. Good for grades 5 to 12 and ages 10 to 18.
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