Nanhong cryptocrystalline texture refers to the special structure of its mineral particles, which cannot be distinguished under the microscope.

South red agate is a gem-grade agate, and its aphanitic texture means that the mineral particles in it can't be seen clearly under a magnifying glass. In contrast, the crystal structure can be observed through a magnifying glass with clearly visible particles. This particularity makes the south red agate have a uniform, smooth and continuous appearance, which is very popular in jewelry and decorations.