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.
Find the hidden crystals when you open your own geodes from this fun set.
This kit will get your paper plane ready for takeoff!
This classic desk toy will keep you amused! Large, 7 inch tall version.
Learn all about the science of light, optics and visual perception with this wonderful kit!
The Duncan Phoenix Diabolo features a stable, hard rubber shell that retains its shape.
Working model representing the sun, earth, and moon and their relationships.