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.
Every kid needs one of these spheres!
This classic desk toy will keep you amused!
Discover a world of kaleidoscopic effects within this perfectly clear prism of the Light Crystal!
Use this kit to introduce electromagnetic principles in the classroom setting!
Build a model green house and 9 other green energy-related devices with this great kit!
Build a hand that realistically moves its fingers using shape memory allow technology!
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