12-Pack Off-White Unglazed Porcelain Streak Plates for Rock and Specimen Testing

This 12-pack of streak plates is made from off-white unglazed porcelain, each measuring 1.9 x 1.9 x 0.2 inches. The unglazed surface reveals the powder color (streak) of minerals when scraped across it, which is often different from the mineral's surface color and is a key diagnostic property for identification. Streak plates are reusable and can be cleaned between tests. The pack of 12 provides enough plates for group activities and full-class geology labs. Suitable for geology and earth science coursework covering mineral identification, physical properties of minerals, and field geology techniques.