Alumina silicate is a silicate.Chemical formula: Al2SiO5Due to the highly complex structures of most silicates, they are often not written in the form of salts but rather in the form of the respective oxides of the metals. Therefore, aluminum silicate is commonly written as Al.2O3·SiO2The density of aluminum silicate is between 2.8 to 2.9 grams/cubic centimeter, with a refractive index of 1.56, and it has a Mohs hardness of...The variation is related to the ore type and moisture content, ranging between 4.5 and 7.5. Aluminum silicate powder is commonly used as fire-resistant material.For example, used in the glass industry for constructing glass kilns.