igneous
Pink granite (weathered fragment)
Granite, primarily quartz–feldspar–mica (pink alkali feldspar, plagioclase, quartz, biotite/hornblende)
AI-generated identification · may be incorrectCoarse-grained, visibly interlocking crystals; salmon-pink feldspar, gray translucent quartz, and dark mica/amphibole. Typical hardness is about 6–7 Mohs, vitreous to dull luster, no consistent cleavage as a whole, and specific gravity about 2.6–2.7.
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Physical properties
Coarse-grained, visibly interlocking crystals; salmon-pink feldspar, gray translucent quartz, and dark mica/amphibole. Typical hardness is about 6–7 Mohs, vitreous to dull luster, no consistent cleavage as a whole, and specific gravity about 2.6–2.7.
Formation & geological history
A plutonic igneous rock crystallized slowly from silica-rich magma deep underground, commonly during Precambrian to Mesozoic continental crust formation; the specimen appears weathered and possibly naturally broken.
Uses & applications
Widely used as building stone, countertops, paving, monuments, aggregate, and decorative landscaping material. Ordinary hand specimens generally have little commercial value.
Geological facts
The large crystals indicate slow cooling rather than volcanic eruption. Pink coloration usually reflects potassium-rich alkali feldspar, while dark grains are commonly biotite or hornblende.
Field identification & locations
Identify it by the “salt-and-pepper” coarse texture and abundant pink feldspar; a steel nail should not scratch fresh quartz. Granite and related granitic rocks are plausible around Chongqing, though local exposed bedrock is often sedimentary, so this may be transported gravel or construction stone.
