Talc (Hydrated Magnesium Silicate) has the chemical composition of 3MgO.4SiO2H2O. It is one of the most important industrial minerals and is the most common mineral for daily use as a body and face powder. TALC is also written as H2Mg3(SiO3)4, which corresponds to 4.8% H2O; 31.7% MgO and 63.5% SiO2. It is essentially a secondary … Read more
BARYTE Baryte is generally colourless to white but yellow, red and brown forms can be found due to the inclusion of bituminous matter. Lustre is vitreous to pearly. Baryte has perfect prismatic cleavage and a hardness of between 3 and 3.5. Crystals are usually tabular or prismatic but massive, fibrous, granular varieties can be found. … Read more
Mica is a mineral name given to a group of minerals that are similar in their physical properties and chemical compositions. They are all silicate minerals, which means that chemically they all contain silica(SiO4). Mineralogists call micas sheet silicates because their molecules combine to form distinct layers. These layers can be seen in muscovite mica … Read more