The iron wire of turquoise is limonite, the main component of turquoise is phosphate minerals, and the iron wire appearing on the surface of turquoise is limonite, which is actually a companion of turquoise and will accompany it at the early stage of turquoise formation. This kind of iron wire mainly appears in the form of black veins, which will spread all over the turquoise surface in an irregular shape.
Many jewelry collectors usually use iron wire as the basis to distinguish between true and false turquoise, because the iron wire on the surface of natural turquoise is concave to the touch and has a good three-dimensional effect, while the iron wire imitating turquoise is often convex.
It should be noted that turquoise is a kind of gem with low hardness, but the hardness of the iron wire on it is lower than that of turquoise itself. Therefore, in the process of playing and maintaining turquoise, you must avoid bumping or contacting with hard objects, which is easy to crack.