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To do a streak test, you scrape the mineral across an unglazed porcelain plate. The plate is harder than many minerals, causing the minerals to leave a streak of powder on the plate. The color of the streak often differs from the color of the larger mineral sample. If you did a streak test on the yellow-gold pyrite, you would see a blackish streak. Your instructor will provide you with up to 10 different mineral samples for identification. To test for hardness, you will also be provided with a copper plate or penny, a steel nail, and a glass plate (you can provide your own fingernail). You will also be given a piece of unglazed porcelain tile to use as a streak plate View Lab Report - Mineral Identification Lab Directions and Answer Sheet.pdf from EARTH AND 100 at Ivy Tech Community College of Indiana. Mineral Identification Lab In this lab, you will use the black streak greasy feel gray-black streak, cubic cleavage, density = 7.6 g/cmJ black streak, magnetic green-black streak (fool's gold) red-brown streak greasy feel white-yellow streak easily scratched by fingernail flexible in thin sheets cubic cleavage, salty taste flexible in thin sheets bubbles with acid, rhombohedral cleavage One of the most important tools in the arsenal used for mineral identification is the streak plate. This aid to mineral identification is usually a piece of unglazed porcelain. The two colors most commonly used are black and white with white used for dark colored minerals, and black used for light colored minerals.