Mineral definition in geology
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Mineral Definition in Geology: Key Characteristics
Naturally Occurring and Inorganic Origin
In geology, a mineral is defined as a naturally occurring substance, meaning it forms through natural processes and is not made synthetically in a laboratory. Most minerals are formed by inorganic processes, although some definitions now include certain organic substances as well 14.
Homogeneous Solid with Definite Chemical Composition
Minerals are homogeneous solids, which means they have a uniform structure and composition throughout. Each mineral has a definite, but not always fixed, chemical composition. This means that while the chemical formula is generally consistent, there can be some variation within certain limits 16.
Ordered Atomic Arrangement and Crystalline Structure
A defining feature of minerals is their ordered atomic arrangement. This means the atoms in a mineral are arranged in a specific, repeating pattern, giving the mineral a characteristic crystalline structure. This internal structure is what distinguishes minerals from other naturally occurring substances 156.
Physical and Chemical Properties
Minerals are identified and classified based on their physical and chemical properties, such as hardness, color, luster, and crystal form. These properties are a direct result of their chemical composition and internal structure 56.
Distinction from Rocks and Ores
Rocks are aggregates of one or more minerals, while ores are rocks that contain valuable minerals that can be extracted for economic use. Minerals are the basic building blocks of rocks and ores, and each mineral species has its own unique set of properties 367.
Evolving Definitions and Overlapping Boundaries
The definition of a mineral has evolved over time. While early definitions focused strictly on inorganic, naturally occurring solids with fixed compositions, modern definitions sometimes include substances formed by organic processes and allow for some variability in composition. This has led to some overlap between mineralogy and other scientific fields 3910.
Conclusion
In summary, a mineral in geology is a naturally occurring, homogeneous solid with a definite chemical composition and an ordered atomic arrangement, usually formed by inorganic processes. This definition is central to the study of mineralogy and underpins the classification and understanding of Earth’s materials 1345+1 MORE.
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Toward a definition of a mineral sample in geology
A "subrock" sample in geology can be defined as a probability sample when every mineral species' distribution function in the subrock converges to one distribution, allowing for more precise analysis of discrete distributions.
The Environmental Geology of Mineral Deposits
Natural environmental signatures of mineral deposits are the concentrations and chemical, mineralogical, or biological forms of metals and other constituents in soils, waters, sediments, plants, and organisms before mining.
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