Mineral evolution

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Mineral evolution is a theory that mineralogy has changed through time as a planet’s environment has changed. It suggests that minerals on planets and moons become more varied and complex because of physical conditions, chemical processes, and, on some worlds, living organisms.

In our Solar System, the number of mineral species grew from about a dozen to more than 5,400. This happened mainly through three processes: first, the separation and concentration of elements as planets differentiated into core and mantle and as materials outgassed and melted; second, a wider range of temperatures and pressures, combined with the action of volatiles like water and carbon dioxide; and third, new chemical pathways enabled by life.

Earth’s history of minerals falls into three broad eras. The first era began with the birth of the Sun and the formation of planets, when about 250 minerals formed. The second era came as the crust and mantle were repeatedly reworked by melting and tectonics, bringing the total to roughly 1,500 minerals. The vast majority of Earth’s minerals—more than two-thirds—were created later, through chemical changes driven by living organisms, especially after the Great Oxygenation Event about 2.4 billion years ago.

The idea of mineral evolution was introduced in 2008 by Robert Hazen and colleagues. They used the word “evolution” to describe an irreversible trend toward more complex and diverse mineral assemblages, not biological evolution with mutations and inheritance. Minerals can also go extinct if conditions no longer exist, though a lost mineral could reappear under the right environment.

Long before minerals existed, there were no rocks or minerals in the very early universe. Heavier elements such as carbon, oxygen, silicon and nitrogen formed inside stars and during stellar explosions. Tiny minerals first appeared in the hot, fiery environments around young stars and in the material ejected by supernovae. Some of these “ur-minerals”—like certain oxides, silicates, and other high-temperature phases—seeded the cloud that would become the Solar System.

After the Solar System formed, the main drivers of mineral evolution were:

- Separation and concentration of elements (planetary differentiation, outgassing, partial melting and crystallization).
- Wider ranges of temperature and pressure, plus the action of volatiles.
- New chemical pathways created by living organisms.

As planets cooled, minerals could form new phases and become more specialized. Volatile compounds like water and oxygen allowed new minerals such as hydrates, carbonates and sulfates to appear. Different environments—ice caps, dry lake beds, or metamorphic rocks—produce distinctive mineral suites.

Life made a dramatic impact. The Great Oxygenation Event began around 2.4 billion years ago, flooding Earth’s atmosphere with oxygen and enabling many new minerals, especially oxides and uranyl minerals from oxidized uranium. Biomineralization—minerals produced by organisms—also flourished, leading to minerals such as calcite, aragonite, apatite and opal, and many other mineral types found in shells, skeletons and bones. In total, about 2,500 minerals formed during Earth’s history, with most of the later additions tied to biological and atmospheric changes.

Humans have now altered mineral diversity too. Some 208 minerals are recognized mainly or exclusively because of human activity, often through mining, industry and the creation of synthetic materials. Some scientists even propose calling a new geological epoch the Anthropocene to reflect these human-driven changes. Humans have redistributed rocks and minerals on a global scale, sometimes matching the scale of natural processes like glaciation.

Mineral evolution also touches on life’s origins. Minerals may have helped life start—clays and certain metal sulfides are proposed as catalysts or templates for early chemistry, and phosphorus-bearing minerals could release essential nutrients. Conversely, minerals are needed for life’s survival, providing surfaces, catalysts and sources of elements like phosphorus and trace metals.

Researchers study mineral evolution by looking at the age distribution of minerals, the appearance of new minerals after major events (like the assembly of continents or supercontinents such as Columbia), and the way mineral properties change over time. This field links geology, chemistry, biology and history to tell a broad story: the planet’s minerals record the changing story of its environment, from fiery beginnings to a world shaped by life and human activity.