Clay minerals

The key difference between kaolin and bentonite clay is that the kaolin clay forms as a result of weathering of aluminium silicate minerals such as feldspa

Limonite is a mineral that is composed mainly of hydrated iron oxides, typically goethite and/or lepidocrocite, along with other minerals such as magnetite, hematite, and quartz. It is a yellowish-brown to dark brown mineral with a dull or earthy luster and a hardness of 4 to 5.5 on the Mohs scale. Limonite is a secondary mineral that forms from the weathering of other iron-bearing minerals and is often found as nodules, concretions, or layered deposits in sedimentary rocks or soils. It is…

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What is Marble? Marble is a metamorphic rock which is non foliated and is formed when limestone is subjected to heat and pressure where calcite recrystallises to form a rock that is a mass of interlocking calcite crystals. In marble not all of the rock is formed of calcite other minerals can also be present such as clay minerals, micas, quartz, pyrite, iron oxides and graphite. Same as of the limestone marble, dolostone when metamorphose produces dolomitic marble. How does marble forms?…

Marble is a metamorphic rock composed of recrystallized carbonate minerals, maximum generally calcite or dolomite. Marble may be foliated.

Bauxite, an aluminium ore, is the world’s main source of aluminium. It consists mostly of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH), mixed with the two iron oxi…

Making natural paints.

Azurite with Malachite from Mexico

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