Growan is a geological term used to describe a type of igneous rock formed by the process of weathering and erosion. It is primarily composed of coarse-grained, angular fragments of quartz, feldspar, and other minerals, embedded in a matrix of fine-grained material known as matrix. This matrix is typically made up of fine grains of feldspar, mica, and clay minerals.
The formation of growan occurs when intrusive igneous rocks, such as granite, are exposed to the Earth's surface and subjected to weathering processes. This exposure leads to the physical breakdown of the original rock, resulting in the production of fragmented pieces. Over time, these fragments are further transported and deposited by various agents, such as water or wind, leading to the accumulation of growan.
Growan typically has a coarse and uneven texture, with visible angular fragments and a noticeable contrast between the larger clasts and the finer matrix in which they are embedded. Its color can vary widely, depending on the mineralogical composition of the parent rock.
Due to its composition and texture, growan is often associated with highly weathered terrains, such as regions with extensive glacial or fluvial activity. It is frequently found in areas of ancient mountain ranges, where the rocks have been subjected to millions of years of weathering and erosion. Growan can also be found in coastal areas, where wave action and tides have contributed to its formation.
