igneous
Granite retaining-wall blocks
Granite, principally quartz, potassium feldspar, plagioclase, and mica
AI-generated identification · may be incorrectCoarse-grained, gray speckled appearance with interlocking crystals; quartz hardness 7, feldspars about 6, mica 2–3. Typically nonporous, strong, and massive, with no consistent cleavage as a whole rock.
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Physical properties
Coarse-grained, gray speckled appearance with interlocking crystals; quartz hardness 7, feldspars about 6, mica 2–3. Typically nonporous, strong, and massive, with no consistent cleavage as a whole rock.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, generally during Precambrian to Phanerozoic plutonic events. The blocks are mechanically cut and possibly split or textured for landscaping.
Uses & applications
Used extensively for retaining walls, curbs, paving, foundations, monuments, and aggregate; these appear to be landscaping blocks rather than jewelry material.
Geological facts
Granite’s visible crystals indicate slow underground cooling. Its weather-resistant mineral assemblage makes it well suited to outdoor construction.
Field identification & locations
Identify by the coarse interlocking grains, gray color, quartz-glass sparkle, and feldspar crystals; distinguish it from concrete by its natural crystal pattern and lack of cement paste. Common worldwide, including major quarry regions in the United States, Canada, India, and Scandinavia.
