igneous
Granite building stone
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectVisible coarse crystals; beige to gray with rusty orange surface staining, typically vitreous quartz and feldspar with darker mica. Hardness about 6–7 Mohs; interlocking crystals, no cleavage as a whole rock, specific gravity roughly 2.6–2.7.
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Physical properties
Visible coarse crystals; beige to gray with rusty orange surface staining, typically vitreous quartz and feldspar with darker mica. Hardness about 6–7 Mohs; interlocking crystals, no cleavage as a whole rock, specific gravity roughly 2.6–2.7.
Formation & geological history
Magma cooled slowly deep in the crust, allowing large crystals to form; the exact age and quarry source cannot be determined from the image. Granite bodies occur across a wide range of geological ages.
Uses & applications
Commonly used for paving, walls, steps, monuments, and architectural cladding; attractive, durable blocks may also be cut into countertops.
Geological facts
Its orange-brown patches are likely iron-oxide weathering stains rather than a distinct mineral layer.
Field identification & locations
Identify by its coarse, interlocking quartz and feldspar grains and high hardness; widespread in continental crust and quarried globally. This appears to be a large construction block, not a collectible specimen.
