1. Silicates: This is the largest and most important group, making up over 90% of Earth's crust. They are composed of silicon and oxygen, often with other elements like aluminum, iron, magnesium, calcium, sodium, potassium.
Examples:
* Quartz: SiO2
* Feldspar: (K,Na,Ca)(Al,Si)4O8
* Mica: (K,Na)(Al,Mg,Fe)3(Si,Al)4O10(OH,F)2
* Pyroxene: (Ca,Mg,Fe)SiO3
* Amphibole: (Ca,Na)2(Mg,Fe,Al)5(Si,Al)8O22(OH,F)2
2. Carbonates: These minerals contain the carbonate ion (CO3)2-. They are important constituents of sedimentary rocks, especially limestone and marble.
Examples:
* Calcite: CaCO3
* Dolomite: CaMg(CO3)2
3. Oxides: These minerals are composed of oxygen combined with one or more metals. They are important in many ore deposits and can be found in igneous and metamorphic rocks.
Examples:
* Hematite: Fe2O3
* Magnetite: Fe3O4
* Corundum: Al2O3
4. Sulfides: These minerals contain sulfur combined with one or more metals. They are important in ore deposits and can be found in igneous and metamorphic rocks.
Examples:
* Pyrite: FeS2
* Galena: PbS
* Sphalerite: ZnS
5. Sulfates: These minerals contain sulfur combined with oxygen (sulfate ion SO4)2-. They are common in sedimentary rocks and evaporite deposits.
Examples:
* Gypsum: CaSO4·2H2O
* Anhydrite: CaSO4
6. Halides: These minerals contain halogens (chlorine, fluorine, bromine, iodine) combined with one or more metals. They are common in evaporite deposits and some sedimentary rocks.
Examples:
* Halite (Rock Salt): NaCl
* Fluorite: CaF2
7. Phosphates: These minerals contain phosphorus combined with oxygen and other elements. They are important in sedimentary rocks, fertilizers, and some biological processes.
Examples:
* Apatite: Ca5(PO4)3(OH,F,Cl)
These are the major families of rock-forming minerals. There are many other less abundant mineral families, but these eight families make up the vast majority of minerals found in the Earth's crust.
