igneous
Rough quartz-rich rock, possibly granite or pegmatite
Likely quartz and feldspar with possible mica; exact rock type cannot be determined from the image
AI-generated identification · may be incorrectSmall, irregular, mottled white, pink-brown and gray specimen with a rough surface and visible crystalline grains. Quartz has Mohs hardness 7 and a vitreous luster; feldspar is typically Mohs 6 and may show cleavage.
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Physical properties
Small, irregular, mottled white, pink-brown and gray specimen with a rough surface and visible crystalline grains. Quartz has Mohs hardness 7 and a vitreous luster; feldspar is typically Mohs 6 and may show cleavage.
Formation & geological history
If granite or pegmatite, it formed as silica-rich magma cooled slowly underground; such rocks range widely in age and occur in continental crust.
Uses & applications
Commonly collected as a geological specimen; quartz- and feldspar-rich rocks are also used as aggregate and in some dimension-stone applications.
Geological facts
The image does not show enough detail to distinguish granite from pegmatite or another quartz-feldspar rock with confidence.
Field identification & locations
Look for interlocking grains: quartz is generally glassy and lacks cleavage, while feldspar commonly has flat cleavage faces. These rocks occur widely in continental regions; a closer view or hardness and streak tests would help identify it.
