Carbonate jade, also called afghanistan jade, is worthless and mainly composed of calcite, so it is also called calcite jade. A small part contains tremolite, which has a high hardness. The color changes because of the impurities it contains. When it contains iron and manganese, it is light yellow, light red, brown black, etc., but it is generally white or colorless. The real afghanistan jade is a kind of jade produced in the Alps. Before 2005, Afghan jadeite was mostly produced in Afghanistan and Turkey. Later, due to the war, most jade mines in Afghanistan were closed. After 2005, most Afghan jadeites on the market were produced in Turkey and Iran. Hetian jade is mainly composed of tremolite, so people often use Afghanistan as Hetian jade to seek ill-gotten gains. Just like diamonds and graphite, the main component is carbon, but their properties and values are quite different.