Vermiculite is a hydrated phlogopite mica belonging to the group of clay minerals and is suitable for use in insulation, concrete, and as a refractory material.
Our silicon dioxide with embedded water is, unlike diatomaceous earth (kieselguhr), a volcanically formed amorphous silicate with high porosity and a high silicate content.
The plutonic rock nepheline syenite consists primarily of syenite, which contains a high proportion of quartz-poor alkali feldspars (orthoclase or microcline).