Definition: Anneals are small, irregularly shaped grains found in various minerals that have been oxidized due to a certain type of weathering process. They are often seen as small, fine, black particles found in rocks. The chemical composition of these grains can be different depending on their environment and age, but they generally contain iron oxide (Fe2O3). These minerals are common in many materials that are not typically rich in iron, including sandstones, granite, limestone, basalt, quartzite, marbles, etc.
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