igneous
Iron-stained quartz-rich rock
Likely quartz-feldspar rock (granite or pegmatite) with iron-oxide staining
AI-generated identification · may be incorrectRough, irregular specimen with pink-brown and gray translucent grains and rusty patches. Quartz is Mohs 7 with vitreous luster and no cleavage; feldspar is softer (about 6) and commonly shows cleavage.
Identified More igneous →
Explore Iron-stained quartz-rich rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Rough, irregular specimen with pink-brown and gray translucent grains and rusty patches. Quartz is Mohs 7 with vitreous luster and no cleavage; feldspar is softer (about 6) and commonly shows cleavage.
Formation & geological history
Likely crystallized from silica-rich magma as granite or pegmatite; iron-bearing minerals later oxidized, producing the rusty coloration. The image does not allow a precise age or rock identification.
Uses & applications
Common examples are used as aggregate or building stone; attractive pieces may be collected, but this specimen appears unpolished and modest in value.
Geological facts
Rust-colored coatings commonly form when iron minerals weather to hematite or goethite.
Field identification & locations
A quartz-rich, feldspar-bearing texture and hard glassy grains would support this identification; field confirmation requires a closer look at grain boundaries and mineral hardness. Similar rocks occur widely in continental crust.
