Garnet

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Garnets are a family of silicate minerals that have been utilized as gemstones and abrasives since the Bronze Age. All varieties of garnets possess identical physical properties and crystal structures, yet they differ in chemical composition. These minerals can be found worldwide in metamorphic, igneous, and sedimentary rocks. Most garnet discovered near Earth's surface forms when a sedimentary rock with high aluminum content, like shale, is subjected to heat and pressure intense enough to produce schist or gneiss. Garnet is also found in the rocks of contact metamorphism, subsurface magma chambers, lava flows, deep-source volcanic eruptions, and the soils and sediments formed when garnet-bearing rocks are weathered and eroded. https://www.mindat.org/min-10272.html https://geology.com/minerals/garnet.shtml