igneous
Crushed Granite and Quartz Gravel
Composite Igneous and Silicate Rock Aggregate
Hardness varies from 6 to 7 on the Mohs scale depending on mineral content; colors range from light gray, off-white, to subtle pinkish or tan hues; luster is vitreous to dull; granular to massive crystal structure with no notable cleavage.
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Physical properties
Hardness varies from 6 to 7 on the Mohs scale depending on mineral content; colors range from light gray, off-white, to subtle pinkish or tan hues; luster is vitreous to dull; granular to massive crystal structure with no notable cleavage.
Formation & geological history
Formed from the weathering, mechanical breakdown, and quarrying of intrusive igneous rocks like granite alongside quartz-rich pegmatites, deposited as natural or processed aggregate.
Uses & applications
Widely used in construction, road base, landscaping, concrete aggregate, and pathway materials.
Geological facts
Aggregate materials of this type form the foundational base for much of modern civil engineering and infrastructure.
Field identification & locations
Easily identified in the field by hard, angular fragments of quartz and feldspar mixed with finer silty matrix; commonly sourced from local quarries.
