- Functions:Soil Conditioner
- Synonyms:Quartz, Siderite (SiO2), α-Quartz
Whittemore Vermiculite A-3 is a lightweight and all-natural mineral used in insulating and fireproofing. It is an expanded mica-type mineral. It is composed of hydrated laminar magnesium-aluminum-iron silicate, which resembles mica in appearance.