MnTe is a semimetal layered compound. The powder is highly crystallized at high temperatures and high pressures over 1 month time frame to achieve good crystallization and to prevent from oxidization. Each order contains +1 gram highly crystalline powder and grain sizes measure from 100nm to 3 mm in size. Such large variation is intentional to allow for its use as precursors during CVD, PVD, and MBE as well as scientific studies requiring large physical sizes. If you research needs large amount of the powder, coarser or finer powders please contact us.