Elements:
* Native elements: These are minerals that consist of a single element, such as:
* Metals: Gold (Au), Silver (Ag), Copper (Cu), Platinum (Pt)
* Nonmetals: Carbon (C) as diamond or graphite, Sulfur (S)
* Metalloids: Arsenic (As), Antimony (Sb)
Compounds:
* Oxides: These minerals contain oxygen combined with one or more other elements. Some examples include:
* Hematite (Fe₂O₃): Iron oxide
* Quartz (SiO₂): Silicon dioxide
* Corundum (Al₂O₃): Aluminum oxide
* Sulfides: Minerals containing sulfur combined with a metal. Some examples include:
* Pyrite (FeS₂): Iron sulfide
* Galena (PbS): Lead sulfide
* Sphalerite (ZnS): Zinc sulfide
* Carbonates: Minerals containing a carbonate ion (CO₃²⁻) combined with a metal. Some examples include:
* Calcite (CaCO₃): Calcium carbonate
* Dolomite (CaMg(CO₃)₂): Calcium magnesium carbonate
* Malachite (Cu₂(CO₃)(OH)₂): Copper carbonate hydroxide
* Halides: Minerals containing a halide ion (Cl⁻, Br⁻, I⁻) combined with a metal. Some examples include:
* Halite (NaCl): Sodium chloride (table salt)
* Fluorite (CaF₂): Calcium fluoride
* Sulfates: Minerals containing a sulfate ion (SO₄²⁻) combined with a metal. Some examples include:
* Gypsum (CaSO₄·2H₂O): Calcium sulfate dihydrate
* Barite (BaSO₄): Barium sulfate
* Phosphates: Minerals containing a phosphate ion (PO₄³⁻) combined with a metal. Some examples include:
* Apatite (Ca₅(PO₄)₃(OH,F,Cl): Calcium phosphate with hydroxide, fluoride, or chloride
* Silicates: Minerals containing silicon and oxygen, often with other elements. These are the most common group of minerals in the Earth's crust. Some examples include:
* Feldspar: A group of minerals containing aluminum, silicon, and oxygen, with various other elements.
* Quartz: Silicon dioxide
* Mica: A group of minerals with layered structures, including biotite and muscovite.
* Other: There are also minerals formed from other compound groups, such as:
* Borates: Minerals containing boron and oxygen.
* Nitrates: Minerals containing nitrogen and oxygen.
It is important to note that some minerals can form as a result of solid solutions where two or more different elements or compounds occupy the same crystal structure. This results in a mineral with a variable chemical composition. For example, some feldspars are solid solutions of two or more end-member minerals.
In summary, minerals are formed from a variety of pure materials, including native elements, oxides, sulfides, carbonates, halides, sulfates, phosphates, silicates, and other compound groups. Their formation can involve solid solutions where multiple elements or compounds are present within the crystal structure.
