Brief Geology on Garnet

There are 32 different types of Garnet and it is said that more are likely to be added in the future. Around 20 of those 32 are silicates. The most common minerals we see in the Garnet group are almandine, pyrope, spessartine, and andradite. It can occur in many different colors but the most common is red. Calcium is the cause for a green Garnet while Iron and Manganese are responsible for the red Garnet. Garnet can be found in metamorphic, igneous, and sedimentary rocks. They can also be found near subsurface magma chambers, lava flows, and deep-source volcano eruptions. It can be found as water-weathered (by streams) pebbles or in massive occurrences. Garnet can form metamorphically where shale is being acted on by convergent plate boundaries. The pressure and heat from the activity of these tectonic plates break chemical bonds and force the minerals to recrystallize into a more stable structure that is better able to withstand the new temperature-pressure environment. As these rocks undergo metamorphism, the Garnets start out as tiny little grains. Over a long period of time, they slowly grow larger and larger as the metamorphism process continues. When the Garnet grains grow larger, they begin to displace and replace parts of the host rock, but still leaving some of it intact. In Igneous rocks, Garnet usually occurs as more of an accessory mineral, like granite. In Sedimentary rocks, Garnet can often be found in soils or sediments that have been formed after being eroded and weathered away from their original host rock.
Sources:
“Garnet: A Mineral, a Gem, an Abrasive, a Filter and More!” Geology.com, 2012, geology.com/minerals/garnet.shtml.

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Garnet can also be found in Scotland. East coast.

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