metamorphic
Reddish-brown crystalline rock, possibly weathered granite or garnet-bearing schist
Indeterminate; likely quartz–feldspar–mica rock with iron oxides, potentially garnet-bearing
AI-generated identification · may be incorrectCoarse, irregular fragment with reddish-brown coloration, white crystalline patches, and a dull to slightly glassy luster. Hardness is tentatively 6–7 Mohs; exact mineralogy, cleavage, and density require testing.
Identified More metamorphic →
Explore Reddish-brown crystalline rock, possibly weathered granite or garnet-bearing schist in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, irregular fragment with reddish-brown coloration, white crystalline patches, and a dull to slightly glassy luster. Hardness is tentatively 6–7 Mohs; exact mineralogy, cleavage, and density require testing.
Formation & geological history
Likely formed through igneous crystallization or metamorphic recrystallization, then weathered and fractured; geological age cannot be determined from the photograph. Common environments include continental crust and metamorphic belts.
Uses & applications
If confirmed as granite, it may be used as dimension stone or aggregate; if garnet-bearing, it may have modest lapidary or collecting interest. This small, rough fragment has little commercial value.
Geological facts
The white areas may be quartz or feldspar, while the red-brown color commonly reflects hematite or iron-stained feldspar. A close inspection of grain boundaries and a streak test would help distinguish granite from schist or gneiss.
Field identification & locations
Commonly found in granitic terrains and metamorphic mountain belts worldwide. Use a hand lens, check for visible mica or garnet, test hardness against glass, and examine whether the rock has foliation; a photo alone cannot provide a confident species identification.
More like this
