1. Chemical composition: jet is mainly composed of silicate minerals, including magnesium silicate and calcium silicate. Obsidian is a basalt glass formed during volcanic eruption.
2. Color: The color of jet is mainly light green and dark green, but there may also be changes such as gray and black. The color of obsidian is mainly black, but there may be changes such as brown and red.
3. Texture: The texture of jet is delicate and sometimes translucent. Obsidian has a hard texture and often presents mottled texture or smooth glass texture.
4. Use: Moyu has a long history in China and is used for artistic and decorative purposes such as carving and jade making. Obsidian is often used in jewelry making, jewelry design and other fields.
Generally speaking, jet and obsidian are different in composition, color, texture and use, so they have different characteristics and application value.