The unearthed stone looks like marbled meat. (Photo/Weibo)

The unearthed stone looks like marbled meat. (Photo/Weibo)

The unearthed stone looks like marbled meat. (Photo/Weibo)

Recently, several workers found a piece of "marbled meat" stone while they digging iron ores in Ningxia. Experts say that the "marbled meat" stones were from the Jurassic Period, a geologic period about 100 million years ago. Stones like this are usually with high hardness, fine and smooth colors. They came into being through the combination of sedimentary rocks, siliceous rocks and metamorphic rocks during geological movement.