![Burmese Sapphire Crystal. An Example of a Monocrystalline Material. Photo by crystal-treasure.com. Burmese Sapphire Crystal. An Example of a Monocrystalline Material. Photo by crystal-treasure.com.](https://www.langantiques.com/university/wp-content/uploads/elementor/thumbs/Sapphirecrystal-q88jzy3z3yls6d52153arjcfirj3d4wvc5bzidm8aw.jpg)
Monocrystalline materials are substances with a regular, repeating atomic structure that are composed of a single crystal. The crystal shape is clearly visible, as opposed to polycrystalline materials which are composed of tiny crystals grouped together.