Lignite, often referred to as brown coal, is a soft, brown, combustible, sedimentary rock formed from naturally compressed peat. It is considered the ...
Tantalite (Fe,Mn) Ta2O6 is the primary source of the chemical element Tantalum. It is chemically similar to columbite, and the two are often grouped t...
Iron ores are rocks and minerals from which metallic iron can be economically extracted. Theores are usually rich in iron oxides and vary in color fro...
Aquamarine is a color that is a light bluish tint of green that is in-between Blue and spring green on the color wheel. It is named after the mineral ...
Bentonite is an absorbent aluminium phylosilicate essentially impure clayconsisting mostly of.montmorillonite There are different types of bentonite, ...
Marble is a non-foliated metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite. Pure white marble is the r...