国产亚洲一卡二卡三卡_日韩欧美A∨中文字幕_在线观看日本三级片_午夜福利在线视频网站_污黄网站在线观看_欧洲美熟女乱又伦AV_超碰97久久国产人人澡4k_亚洲高清少妇精品_欧美变态暴力牲交VIDEOS_小蝌蚪午夜精品日韩专区

What are the characteristics and uses of golden natural mica? Golden natural mica is a kind of mica mineral, which contains iron, magnesium and potassium flake structure of aluminosilicate. Phlogopite is characterized by complete cleavage of mica, yellow brown color and gold like reflection, and the …

1. There are a lot of impurities in mineralsMica sheets with different impurities can present different colors. According to different colors, the types of impurities can be determined. Black or green impurities are generally magnetite, which is more harmful; red brown and light brown impurities are …