Description
The unglazed ceramic streak plate, made from high-quality porcelain, is an essential tool for performing the streak test in mineral identification—a simple and effective method to determine a mineral’s identity based on the color of its powdered residue. By rubbing a mineral sample against the plate’s surface, a trace of powder is left behind. This residue reveals the so-called streak color, which may match or differ from the mineral’s external color. Available in both white and black versions, the plate allows testing of minerals with varying tones, enhancing visual contrast for more accurate identification.
HOW DOES THE STREAK TEST WORK?
➢ Rub the mineral directly against the unglazed surface of the plate
➢ Observe the powder residue left after rubbing
➢ The color of the powder (streak) can help distinguish between minerals with similar appearances
➢ It’s important to determine whether the residue is actual powder or broken fragments of the mineral
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