A fine-grained igneous rock, typically with a felsitic texture, often used historically as a building or decorative stone.
Combining 'fels' (relating to feldspar and fine-grained texture) with 'stone.' The term emerged in 19th-century geology to describe rocks suitable for practical use in construction based on their mineral composition and appearance.
Felstone was beloved by historic stonemasons because its dense, fine-grained texture meant it wouldn't crumble like coarser rocks, making it perfect for detailed carved work and building foundations that needed to last centuries.
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