Minerals

Amethyst is a mineral that belongs to the quartz family, known for its purple to violet hue. It is a popular gemstone used in...

Copper is an essential metal that has been used by humans for thousands of years. It is an excellent conductor of electricity and is...

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,...

Sericite is a type of mineral that belongs to the mica group. It is a fine-grained, muscovite mica with a silky luster and is...

Coal is a non-clastic sedimentary rock. They are the fossilized remains of plants and are in flammable black and brownish-black tones. Its main element...

Amber is a fascinating organic gemstone that has captured human fascination for millennia. It's not a mineral, but rather a fossilized resin from ancient...

Aragonite is a carbonate mineral and its formula is calcium carbonate. It has the same formula as Calcite and Vaterite, but has a different...

A pearl is a hard, shiny object produced in living tissue such as a crustacean mollusk or fossil conulariids. It is generally composed of calcium carbonate and mainly aragonite.

Coral is skeletal material produced by marine animals. Coral is organic and created by living organisms. When coral polyps die, the hardened skeleton remains and this material is used as a gemstone. Most corals are white, but nature can create coral in many other colors, including the popular orange to red forms. Usually its compound is calcium carbonate.

Kaolinite is a clay mineral with chemical composition Al2Si2O5(OH)4. It is an important industrial mineral. Rocks rich in kaolinite are called kaolin. Kaolinite, common group of clay minerals that are hydrated aluminum silicates; they contain the main components of kaolin (china clay). The group includes kaolinite, which is chemically similar but amorphous to kaolinite, and its rarer forms, stalagmite and nacrite, halloysite and allophane.

Manganite is a member of oxide minerals with composed of manganese oxide-hydroxide of formula: MnO(OH).A widespread and important ore of manganese. The mineral had been described by a number of different names since 1772, but was finally given its current name, which it owes to its manganese component, in 1827.

Turquoise is a member of phosphate mineral with chemical the formula CuAl6 (PO4)4(OH) 8·4H2O. Turquoise is an opaque, blue-to-green mineral that is a hydrated phosphate of copper...