About 200 minerals make up the bulk of most rocks. The feldspar mineral family is the most abundant. Quartz, calcite, and clay minerals are also common.
Some minerals are more common in igneous rock (formed under extreme heat and pressure), such as olivine, feldspars, pyroxenes, and micas.Metamorphic rocks are those that have been transformed by pressure and heat but that have not actually melted.
They contain many minerals in the mica family and high-pressure types such as garnet. Igneous and metamorphic rocks are not present in Indiana's bedrock unless buried very deeply.
https://igws.indiana.edu/RocksAndMinerals/
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