These 1/4 inch thick black streak plates are ideal for testing the hardness or softness of minerals, as well as determining the color of lighter-colored minerals. By scratching the mineral in question against the plates, students or teachers can determine these properties by observing the quantity and hue of the residue left behind. Excellent for use in the classroom, or at home for aspiring geologists.
Explore the wonders of wind power with this amazing kit!
Defy gravity with this cool balancing eagle!
An ancient toy featuring optical illusion and hands-on fun that never grows old!
Build a model green house and 9 other green energy-related devices with this great kit!
Find the hidden crystals when you open your own geodes from this fun set.
Build your own 10 inch kaleidoscope with this great kit!
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