Chemistry

Magnesium Silicate Hydroxide {Mg3Si4O10(OH)2}.

Class

Silicate.

Subclass

Phyllosilicates.

Group

Clays and Sometimes Montmorillonite / Semective Group.

Color

Green, Gray, Silver, and White are the most common colors.

Luster

Dull to a greasy pearl.

Crystal System

Monoclinic; 2/m.

Transparency

Masses of talc are usually opaque, while crystals are translucent.

Cleavage

Basal, or perfect in one direction.

Frature

Uneven to lamellar.

Strak

White in color.

Hardness

1 on the Mohs hardness scale.

Crystal Habits

Never found in large individual crystals, Usually in compact or lamellar masses.
Forms pseudo morph or false shapes.

Specific Gravity

2.7 to 2.8; This is considered around average.

Associative Minerals

Dolomite, magnesite, quartz, olivine, pyroxences, serpentine, amphiboles and biotite.

Similar Species

Talc and pyrophyllie are hard to tell apart by physical properties.

Field Indicators

Color, Softness, soapy feel, cleavage, and luster.

Silicon Dioxide

Above 60%.

Magnesium Oxide

30%.

Hydrochloric Soluble Substance

Below 2.0%.

Water Soluble Substance

Below 0.1%.

PH Value

The Litmus test paper become neutral.

Water-Soluble Iron

The Litmus test paper does not  become blue.

Arsenic

<2ppMa

Ignition Loss

Below 5%.

Asbestous

No Asbestous can be found through X-Rays diffraction analysis.

Bacterium

Total bacteria <500Pcs/g, mold<100Pcs/g No pathogen can found in inspection.

Fineness

It is deter mind  through consulation by the buyer and the seller.

Whiteness

It is deter mind  through consulation by the buyer and the seller.

Brightness

It is deter mind  through consulation by the buyer and the seller.

Note:

This Technical Parameter is Only for Reference. This specific Parameter shall be Subject to the Agreed by both parties.

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