Vermiculite is a mineral that contains magnesium and degenerates from hydrated aluminium silicates. This product appears as brown crystalline powder/flakes. It can be used in coatings and refractory materials. Vermiculite ore process heat-resistant, inert, inorganic, lightweight and absorbent, making it an excellent loose fill insulation that protects against heat, sound and moisture. Exfoliated vermiculite is used in both hand- and spray-applied general building plasters to improve coverage, ease of handling, adhesion to a wide variety of substrates, fire resistance, and resistance to chipping/cracking/shrinkage. Acoustic- and fire-protection products often use vermiculite combined with a binder such as gypsum, portland cement, or (more rarely) an air setting clay, plus fillers and rheological aids.