chemically, it is characterized by high silicon and ignition loss, low aluminum and iron, rich potassium, belonging to the rhyolitic vitric tuff of the intermediate|acid rock type,being of calc|alkaline series, and oversaturation relative to aluminum.

• 化学成分具有高硅、富铝、丰钾、低铁等特征 ,为中酸性岩类、钙碱系列、铝过饱和的流纹质凝灰岩 ;