igneous
Iron-stained quartz-rich rock (likely feldspar-rich granite or pegmatite)
Quartz and feldspar, with iron-oxide staining; exact rock type cannot be confirmed from the image alone
AI-generated identification · may be incorrectRough, opaque, orange-brown and cream; likely quartz (Mohs 7) and feldspar (Mohs 6), with a vitreous-to-dull luster. Grain size and cleavage are difficult to determine from this small specimen.
Identified More igneous →
Explore Iron-stained quartz-rich rock (likely feldspar-rich granite or pegmatite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Rough, opaque, orange-brown and cream; likely quartz (Mohs 7) and feldspar (Mohs 6), with a vitreous-to-dull luster. Grain size and cleavage are difficult to determine from this small specimen.
Formation & geological history
Likely formed by slow cooling of silica-rich magma, then colored by iron oxides during weathering. The image does not allow its age or precise formation setting to be determined.
Uses & applications
Quartz- and feldspar-rich rocks are used as aggregate and dimension stone; attractive pieces may be kept as inexpensive specimens.
Geological facts
Orange-brown coloration commonly comes from iron oxides such as hematite or goethite coating or staining the minerals.
Field identification & locations
Look for interlocking grains and glassy quartz alongside blocky feldspar; a fresh, unweathered surface would help confirm the identification. Quartz-rich granites and pegmatites occur worldwide.
