igneous
Small rounded stone, likely quartz-rich granite or granitic rock
Probable granitoid fragment; mainly quartz (SiO₂) and feldspar, with minor dark mica/amphibole
AI-generated identification · may be incorrectApproximately 8–12 mm, pale gray-white with a darker weathered patch, granular texture, and mostly dull to weakly vitreous luster. Quartz hardness is 7, feldspar 6–6.5; the specimen has no obvious cleavage at this scale and likely specific gravity around 2.6–2.7.
Identified More igneous →
Explore Small rounded stone, likely quartz-rich granite or granitic rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Approximately 8–12 mm, pale gray-white with a darker weathered patch, granular texture, and mostly dull to weakly vitreous luster. Quartz hardness is 7, feldspar 6–6.5; the specimen has no obvious cleavage at this scale and likely specific gravity around 2.6–2.7.
Formation & geological history
Likely an eroded fragment from coarse intrusive igneous rock that crystallized slowly from magma deep in Earth’s crust, commonly during Precambrian to Phanerozoic geological events. Exact identification and age require microscopy or chemical testing.
Uses & applications
Common granite is used in construction, countertops, monuments, aggregate, and landscaping; this tiny fragment has primarily educational or collecting value.
Geological facts
The visible speckled appearance is consistent with interlocking quartz and feldspar grains, though the image is insufficient to distinguish granite from quartzite, gneiss, or a manufactured pebble.
Field identification & locations
Look for individual translucent quartz grains, blocky feldspar, and a scratch resistance greater than steel for quartz-rich material; acid testing and a hand lens can help, while a streak plate is usually uninformative. Granitic rocks occur widely on continental landmasses.
