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Streak Plates and Magnets


Streak plates


Black: 3 for $3.99  
White: 3 for $3.99  

Black: 10 for $9.99  
White: 10 for $9.99  

Streak Plates

The "streak test" is a way of determining the color of a mineral in powdered form. A specimen of the mineral is placed against a piece of unglazed porcelain plate (known as a streak plate) and scraped across the surface of the plate. If a powdered residue is left behind, the color of that powder is known as the mineral's "streak color." The observer must determine if the mark left on the streak plate is a genuine "powder" or if it is composed of granules or broken fragments.

These streak plates are approximately 2" x 2" in size and about 3/16" thick. They are a good size for classroom, field, and laboratory use. The black plate allows for easier examination of a white mark to determine if it is a powder or if it is granules or broken fragments.

Magnets

Magnets
Ten $5.99
 
Three $2.99
Some minerals such as magnetite and pyrrhotite respond to a hand-held magnet. These small magnets are useful in determining the basic magnetic properties of mineral specimens. This can be important information to consider when identifying a mineral. They measure approximately 3/16 x 3/16 x 7/8 inches in size.