Vermiculite in the nature is from fine polca (as one of the clay soils) to large plates of a few centimeters in size and expanded in form of accordion beads. The color of these minerals is from black to brown in raw, golden, brown and bronze specimens in expanding specimens. Vermiculite hardness is between 1.5 to 2 (on a mouse scale). Also, the touch of this mineral is soap and comparable to talc in this respect.Vermiculite is the general name of a group of iron and magnesium hydrated aluminosilicates and part of a group of phyllosilicate minerals (plate silicates), which is similar in appearance to mica. The group of Mica minerals includes biotite minerals, mesquite, lipodolite and phlogopite, which causes vermiculite from alteration or weathering of biotite and phlogopite minerals.The name Vermiculite has been derived from the Latin word vermiculus, worm,Vermiculita, Vermiculit, and Vermicular means worm like because of the heat shock (more than 870 degrees Celsius), its volume is increased by 20 to 30 times the initial volume. (Expanded) and worm-like strings, which is the most important feature of this material.In the past, the names Jefferisite, Kerrite, Protovermiculite, and Voalite were used, but today the term Vermiculite is commonly used.
Raw vermiculite is less used and is used expanded. The most important application is in agriculture (preparation of various fertilizers, herbicides, insecticides and mixing with soil causes more porosity and soil absorption). Consupmtion in various industries is about 32% in gardening ,building materials (36%) (gypsum and cement production with Light weight and the addition of vermiculite to concrete mixtures and creation of lightweight concrete mix ), filler materials, sound and thermal insulators (27% thermal insulation).