igneous
Porrphyritic pink granite (weathered)
Granite, commonly composed of quartz, alkali feldspar, plagioclase, and biotite/hornblende
AI-generated identification · may be incorrectCoarse-grained, pink to reddish-gray rock with scattered pale feldspar and dark mafic minerals; visible sparkling surfaces indicate quartz or feldspar. Granite typically has Mohs hardness 6–7, vitreous to dull luster, no cleavage as a rock, and specific gravity about 2.63–2.75.
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Physical properties
Coarse-grained, pink to reddish-gray rock with scattered pale feldspar and dark mafic minerals; visible sparkling surfaces indicate quartz or feldspar. Granite typically has Mohs hardness 6–7, vitreous to dull luster, no cleavage as a rock, and specific gravity about 2.63–2.75.
Formation & geological history
A felsic intrusive igneous rock crystallized slowly from magma deep underground, generally in Precambrian to Cenozoic plutons. The rounded shape and dull surface reflect prolonged weathering and abrasion.
Uses & applications
Widely used as building stone, paving, monuments, countertops, aggregate, and decorative landscaping material. This weathered specimen has little gem or collector value, usually about $1–$15.
Geological facts
The pink color most often comes from potassium feldspar; dark patches are biotite or amphibole, while translucent gray grains are quartz.
Field identification & locations
Identify it by its interlocking visible crystals, lack of layering or fossils, and inability to scratch quartz with a steel knife. The reported Michoacán-area locality plausibly contains volcanic and intrusive igneous rocks, though exact identification requires a fresh surface or thin section; it could alternatively be pink rhyolite if the texture is much finer-grained than it appears.
