VERMICULITE consists essentially of mica-like silicate layers separated by double sheets of water molecules carrying exchangeable cations, the cations being located midway between the water sheets ...

Aluminum silicate is insoluble and often used as a refractory in glassmaking. Categories include sillimanite, fibrolite, and mica (muscovite, biotite, and phlogopite). Mica is fireproof and non-fusing ...