In May 2020, beautiful and very interesting blue fluorites were discovered in the Xia Yang mine near the city of the same name in the Chinese province of Fujian. Their growth had resulted in skeletal, tiled cube surfaces. This tiled surface structure resembles a square-coded source code used for product identification, and Chinese traders promptly dubbed it "QR-code fluorite."
The beauty of some pieces lies in the fact that one can clearly see what caused the growth disturbance: tiny quartz crystals have coated the cubes, but only on one face of each cube have they created a homogeneous layer that completely blocked further growth. On the other faces, the cube shape, in combination with the rhombic dodecahedron, continued to grow in a restricted manner, resulting in the "QR" tiling.
Jürgen Tron