Specific weight of talc, its properties, types and table of values
Talc is a mineral of the hydrated aluminosilicate class, belonging to the talc group. This type of material is formed through metamorphic action on magnesian silicates such as olivine, amphiboles, micas, serpentine, chlorites and pyroxenes, as well as on aluminosilicates of thermal waters containing silica and carbonic acid. Talc forms under the action of high pressure on dolomite strata at great depths. It has several synonymous names: steatite and soapstone.
Table of the specific weight of talc
Since talc is a complex material, it is not possible to calculate its specific weight independently in field conditions. These calculations are carried out in specialized chemical laboratories. However, its average specific weight is known and equals 2.7 g/cm3.
To simplify calculations, the table below shows the specific weight values of talc, as well as its weight depending on the units of measurement.
| Material | Specific weight (g/cm3) | Weight of 1 m3 (kg) |
| Talc | 2.7 | 2700 |
Properties of talc
This material has a light green color in large-leaf aggregates, sometimes with a brown or yellowish-white tint. In nature, it may occur as colorless, as well as strongly colored up to dark green and brown. The latter, in turn, characterize this material as contaminated types of talc stone. The intensity of the color also depends on the presence of impurities or iron hydroxides in its composition. Thin plate varieties, as well as iron-free and light-colored varieties, are characterized by translucency and transparency.
Talc has a pearly, glass-like luster on cleavage planes; in dense masses the luster is shimmering and dull. This type of material feels greasy to the touch. It has excellent cleavage into flakes that are slightly more elastic than those of pyrophyllite. It is completely inert to alkalis and acids.
This material has the lowest hardness value (the lowest mark on the Mohs scale) and is easily cut.
Types of talc
Talc has several varieties:
- Minnesotaite, where the iron content ranges from 50 to 80 percent
- Willemseite, which contains a high percentage of nickel
- Steatite or soapstone, which has a dense mass and massive dimensions
- Agalite, which has fine fibers
- Noble talc, which has a light and transparent appearance
Applications of talc
Talc is used in many types of production. In general, this material is used as a refractory and acid-resistant material. The main areas of talc use include:
- Paper industry
- Leather industry
- Textile industry, where talc is used for bleaching cotton
- Rubber industry, where talc is used as a filler in the powdering process for rubber products
- Cosmetics industry, where this material is used in the production of powders, pastes and ointments
- Paint industry, where this material is used to create refractory and light-resistant paints
- Food industry
- Medicine, where talc is used in the production of talcum powder
- Use in electronic equipment
- Use for decoration and electrical insulation in jewelry making
Frequently Asked Questions
Can the density of talc be used for precise calculations?
The density and weight values for talc in this article are reference values. They are suitable for preliminary estimates, but design, construction, production and other critical calculations should be checked against standards, material datasheets or measurement results.
Why can the actual weight of talc differ from the table?
The actual weight of talc depends on composition, moisture, temperature, porosity, fraction size, material grade and measurement conditions. Because of this, real values may differ from the average table data.
How do you calculate the mass of talc from density?
For an approximate calculation, use the formula: mass = density × volume. If the density of talc is given in kg/m³ and the volume is in m³, the result will be in kilograms.