This set of 40 white and 40 black streak plates is an economical option for teachers, geologists, or students, and is excellent to have on hand in an earth science classroom. Streak plates allow you to test the hardness of softness of minerals, as well as their streak color. 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. White streak plates are intended for darker or colorful minerals, while the black streak plates are ideal for lighter-colored minerals.
Discover how solar cells make electricity with this awesome kit!
This magic bird defies gravity before your very eyes!
This beautiful candle holder is carved out of natural amethyst!
Provides the power to execute all the basic electrostatic demonstrations on an energetic and dramatic scale with up to 350,000 volts!
This microscope is so versatile you can even take it with you on a job site!
Defy gravity with this cool balancing eagle!