Granite boulder

Coarse-grained, speckled gray rock with visible interlocking quartz, feldspar, and dark mica; typically Mohs 6–7, vitreous to dull luster, no cleavage as a rock, and specific gravity about 2.63–2.75.

Slow cooling of silica-rich magma deep in the continental crust produced its crystals, commonly during Precambrian to younger continental mountain-building events; these boulders may be glacially transported and weathered at the surface.

Widely used for dimension stone, countertops, monuments, paving, aggregate, and landscaping; this large weathered specimen has limited gem or collector value.

The light gray color and coarse interlocking texture are characteristic of granite, though exact identification may require a close mineral examination or thin section.

Common in continental shields, mountain belts, and glacial deposits worldwide, including New England, the Canadian Shield, Scandinavia, and many other regions. Look for visible quartz and feldspar grains, hardness sufficient to scratch glass, and lack of layering or foliation.