What is the red bamboo stone shadow stone?

Red bamboo stone and shadow stone are a kind of Feng Shui stone, which are relatively simple and primitive, not as full of jewels as secular jewelry. Red bamboo stone is a rare jade produced in Nara, Japan. It is a sacred stone unique to Japanese Buddhism. The red bamboo stone itself is a substance produced by gold and silver ore, so there are often black iron lines or black patterns on the red bamboo stone. This is caused by silver oxide. Simply put, the black color of red bamboo stone is silver. Good-quality red bamboo stones sometimes have yellow gold particles, which become gold threads if connected into a line. Therefore, red bamboo stone is famous as "golden iron wire". In ancient Japan, the control of the red bamboo stone mine not only had theological significance, but also had an important economic position, because the red bamboo stone can be directly smelted into gold after being melted at high temperature. The "daiban gold" in ancient Japanese coins was cast from gold smelted from red bamboo stone.