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Mineral Families and Groups

Mineral families and groups are essential classifications in geology that help scientists understand the vast diversity of minerals found in the Earth's crust. These classifications are based on the chemical composition and structure of minerals, particularly the anion or anion complex that defines each group. By organizing minerals into families, geologists can better study their properties, origins, and uses. This system is crucial for identifying minerals in the field and laboratory, as well as for understanding the geological processes that form them. The most significant mineral group is the silicates, which make up the majority of the Earth's crust. Other important groups include oxides, sulphides, sulphates, halides, carbonates, and native minerals. Each group has distinct characteristics that influence the minerals' physical and chemical properties, making them vital to various geological and industrial applications.

Figures (10)

Mineralogy applies principles of chemistry, geology, physics and materials science to the study of minerals
Page from Treatise on mineralogy by Friedrich Mohs (1825)
The Moon Mineralogy Mapper, a spectrometer that mapped the lunar surface[1]
Calcite is a carbonate mineral (CaCO3) with a rhombohedral crystal structure.
Aragonite is an orthorhombic polymorph of calcite.
The perovskite crystal structure. The most abundant mineral in the Earth, bridgmanite, has this structure.[8] Its chemical formula is (Mg,Fe)SiO3; the red spheres are oxygen, the blue spheres silicon and the green spheres magnesium or iron.
Portable Micro-X-ray fluorescence machine
Photomicrograph of olivine adcumulate from the Archaean komatiite of Agnew, Western Australia.
Hanksite, Na22K(SO4)9(CO3)2Cl, one of the few minerals that is considered a carbonate and a sulfate
A color chart of some raw forms of commercially valuable metals.[30]

Mineral families and groups are categories that help scientists organize minerals based on their chemical makeup and structure. The main way to sort them is by the anion or anion complex in their chemical formula. This helps scientists understand how minerals form, what they look like, and how they behave.

For example, silicates are the biggest group and include minerals like quartz and feldspar. Each group has unique traits that affect how the minerals act and where they're used. To picture this, think of each group as a family with shared traits, like how all members might have similar shapes or colors.

This system makes it easier to study and identify minerals in nature and labs.

Key Points

  • Mineral families refer to groups of minerals that share similar chemical compositions, crystal structures, or physical properties, allowing for their classification and study.
  • Carbonates are a group of minerals characterized by the carbonate ion (CO3^2−) as their primary anion, commonly including minerals like calcite and dolomite.
  • Silicates are the most abundant group of minerals in Earth's crust, characterized by the presence of silica tetrahedra (SiO4^4−) in their structures, forming a variety of configurations such as chains, sheets, and frameworks.
  • Oxides are minerals in which oxygen (O^2−) is the primary anion, excluding those with oxygen complexes like carbonates or silicates, and include important minerals such as hematite and magnetite.
  • Sulfides are minerals characterized by the sulfide ion (S^2−) as their primary anion, including economically important ores like galena (PbS) and pyrite (FeS2).
  • Halides are minerals that contain halogen elements (such as fluorine, chlorine, bromine) as their primary anions, with examples including halite (NaCl) and fluorite (CaF2).

Terms

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