mineral
Uncertain gray-and-white rock fragment
Likely quartz-bearing granite or quartzite; exact identification requires testing
AI-generated identification · may be incorrectCoarse, irregular gray-and-white texture with possible vitreous quartz and darker mineral grains; estimated Mohs hardness 6–7, but cleavage, crystal structure, and specific gravity cannot be confirmed from the photo.
Identified More mineral →
Explore Uncertain gray-and-white rock fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, irregular gray-and-white texture with possible vitreous quartz and darker mineral grains; estimated Mohs hardness 6–7, but cleavage, crystal structure, and specific gravity cannot be confirmed from the photo.
Formation & geological history
If granite, it crystallized slowly from silica-rich magma; if quartzite, it formed by metamorphism of sandstone. The specimen’s geological age and locality are indeterminate.
Uses & applications
Common granite is used for construction and aggregate; quartzite is used as building stone and industrial silica. This small fragment has negligible commercial value.
Geological facts
The visible light grains may be quartz or feldspar, while dark grains could be mica, amphibole, or other mafic minerals.
Field identification & locations
A glassy grain that scratches glass suggests quartz; dilute acid bubbling would indicate carbonate rather than granite or quartzite. A closer image, locality, streak, hardness, and acid tests are needed for a confident identification.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary