Description

Illite is a clay mineral with an intermediate composition between montmorillonite and muscovite. It is a common component in various soils and sediments and is used in a range of industrial and cosmetic applications due to its unique properties.

Chemical Composition and Structure:

Illite typically contains:

Silica (SiO₂): The primary component, contributing to its structure and stability.
Aluminum Oxide (Al₂O₃): Provides the mineral's layered structure.
Potassium Oxide (K₂O): Interlayer cation that stabilizes the mineral.
Other Elements: Such as magnesium (Mg) and iron (Fe), present in smaller amounts.
The structure of illite is characterized by a 2:1 layered silicate arrangement, with tetrahedral and octahedral layers alternating. The potassium ions are located between these layers, helping to maintain the mineral's stability.

Physical Properties:

Appearance: Typically a fine, powdery substance with a range of colors including gray, brown, and green.
Odor: Odorless.
Texture: Smooth and slightly greasy when in contact with water.
Production Process:

Illite is naturally occurring and is usually extracted through mining. The production process involves:

Mining: Extracting raw illite from clay deposits.
Processing: Crushing and milling the raw material to obtain a fine powder.
Purification: Removing impurities to ensure the quality of the illite.

Applications:

Cosmetics: Used in skincare products such as masks and scrubs for its absorbent and purifying properties. It helps to remove excess oil and impurities from the skin.
Industrial: Utilized in the manufacture of ceramics, paints, and as a drilling mud in the oil industry due to its stability and plasticity.
Environmental: Applied in soil conditioning and pollution control to improve soil structure and reduce contaminants.

Environmental and Safety Considerations:

Illite is generally considered safe for use in cosmetics and industrial applications. It is important to ensure that illite used in consumer products is free from harmful contaminants. Proper handling and use are necessary to avoid inhalation of dust or prolonged skin contact, which may cause irritation.

INCI Functions:


Abrasive agent. It contains abrasive particles to remove stains or biofilm that accumulate on the stratum corneum or teeth. Baking soda, kieselguhr, silica and many others have abrasive properties. Peeling or exfoliating products used in dermatology or cosmetic applications contain abrasive agents in the form of synthetic microspheres, however, these microspheres, or abrasive particles may not be biodegradable and create pollution in aquatic ecosystems.

Absorbent. Absorbs substances dispersed or dissolved in aqueous solutions, water/oil, oil/water.

Adhesive agent. It is one of the methods to improve and optimise the adhesion of the formulation on the skin.

Bulking agent. It regulates the water content, dilutes other solids, can increase the volume of a product for better flow, acts as a buffer against organic acids, helps to keep the pH of the mixture within a certain level.
Synonyms:

CAS: 12173-60-3 EC number 601-803-4 UNII D7BC5B0F46