igneous
Tumbled pink granite or quartz-rich feldspathic rock
Likely granite fragment; pink color chiefly from potassium feldspar (orthoclase/microcline), with quartz and minor biotite or iron oxides
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pink to mauve, mottled granular texture, vitreous quartz glints, and locally micaceous dark inclusions. No reliable cleavage is visible because the specimen is rounded and weathered/polished; granite typically has density around 2.6–2.7 g/cm³.
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Physical properties
Hardness about 6–7 Mohs; pink to mauve, mottled granular texture, vitreous quartz glints, and locally micaceous dark inclusions. No reliable cleavage is visible because the specimen is rounded and weathered/polished; granite typically has density around 2.6–2.7 g/cm³.
Formation & geological history
Coarse granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Phanerozoic mountain-building events. The pictured piece appears naturally rounded or tumbled from a larger granite body.
Uses & applications
Used extensively as building stone, countertops, monuments, paving, aggregate, and landscaping material; small attractive pieces are sold as decorative or educational specimens. Typical value is low unless unusually patterned or polished.
Geological facts
Its speckled appearance reflects interlocking crystals rather than layers, distinguishing it from most sedimentary rocks. Pink feldspar can weather to rusty tones as iron oxidizes.
Field identification & locations
Identify by visible interlocking pink feldspar, translucent gray quartz, and scattered black mica; a glassy streak and hardness near 6–7 support quartz-bearing granite. Common worldwide, especially in continental shields and mountain batholiths.
