igneous
Mica-rich granite (likely weathered pegmatitic granite)
Granite, chiefly quartz (SiO₂), feldspar, and mica (muscovite and/or biotite)
AI-generated identification · may be incorrectCoarse, sparkly interlocking grains; pale quartz and feldspar with reflective mica flakes. Hardness is variable: quartz 7, feldspar about 6, mica 2–3; typically non-cleavable as a whole, though mica splits into sheets. The small specimen appears weathered and mica-rich.
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Physical properties
Coarse, sparkly interlocking grains; pale quartz and feldspar with reflective mica flakes. Hardness is variable: quartz 7, feldspar about 6, mica 2–3; typically non-cleavable as a whole, though mica splits into sheets. The small specimen appears weathered and mica-rich.
Formation & geological history
Formed as silica-rich magma cooled slowly underground, allowing visible crystals to grow. Granite occurs across many geological ages; the age of this particular piece cannot be determined from the image.
Uses & applications
Granite is widely used as building and paving stone, countertops, and aggregate; mica is used in electrical and industrial products. This small rough piece is chiefly suitable for collecting.
Geological facts
Granite is an intrusive igneous rock, not a single mineral; its visible grains are the result of slow cooling at depth.
Field identification & locations
Look for interlocking quartz and feldspar grains with shiny, platy mica. Similar rocks occur in continental plutons and granitic pegmatites worldwide; image alone cannot confirm the exact rock type.
