Porcelain Streak Plates

Each plate is manufactured from high-purity laboratory porcelain, left completely unglazed to maintain its rough, matte surface texture. This finish provides a standard relative hardness benchmark of approximately 6.5 on the Mohs scale, allowing for rapid field sorting of soft vs. hard minerals. With outstanding resistance to structural degradation, these tiles provide a reliable and reusable platform for routine scratching and physical testing.

Key Functional Benefits:

• Definitive Mineral Identification: Forces specimens to deposit a fine powder streak, allowing researchers to evaluate the true underlying color of a mineral independent of external tarnish or weathering
• Built-In Mohs Benchmark: The unglazed porcelain provides a consistent scratch baseline of roughly 6.5 Mohs, helping students immediately distinguish softer minerals from harder silicate structures
• Elite Thermal & Structural Ruggedness: Features a low average coefficient of thermal expansion (3.56 x 10^-5 from 20°C to 200°C), preventing thermal cracking if exposed to high-temperature field environments or sterilization cycles
• Universal Chemical Protection: Resists aggressive acids and bases, allowing users to wipe away persistent metallic streaks with chemical solvents to clean the tile for subsequent samples