igneous
Granite landscaping stone
Granite, typically quartz–feldspar–mica aggregate
AI-generated identification · may be incorrectCoarse-grained, speckled gray and cream rock with black biotite/hornblende; likely Mohs 6–7, vitreous to dull luster, interlocking crystals, no cleavage as a whole, and specific gravity about 2.63–2.75.
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Physical properties
Coarse-grained, speckled gray and cream rock with black biotite/hornblende; likely Mohs 6–7, vitreous to dull luster, interlocking crystals, no cleavage as a whole, and specific gravity about 2.63–2.75.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma slowly crystallized deep underground, generally during Precambrian to Phanerozoic continental crust formation; this specimen has been rounded by weathering or landscaping use.
Uses & applications
Commonly used for garden edging, decorative landscaping, curbing, paving, countertops, monuments, and crushed aggregate; its rough, unpolished form has little jewelry value.
Geological facts
The visible black, white, and gray grains are characteristic of granite, though exact identification requires a fresh surface or thin section; it may also be a closely related granodiorite.
Field identification & locations
Look for visible quartz, light feldspar, and dark mica or amphibole in a tightly interlocking texture; common sources include quarries across North America, Europe, and Asia. A fresh fractured surface and hardness test help distinguish it from weathered concrete.
