igneous
Iron-stained quartz-bearing rock, possibly weathered granite or gneiss
Quartz–feldspar rock with iron-oxide staining; exact identification requires testing
AI-generated identification · may be incorrectCoarse, irregular granular texture with white-gray quartz/feldspar and reddish-brown hematite/goethite staining. Likely hardness about 6–7, vitreous to dull luster, no obvious cleavage in quartz; density commonly 2.6–2.8 g/cm³.
Identified More igneous →
Explore Iron-stained quartz-bearing rock, possibly weathered granite or gneiss in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Coarse, irregular granular texture with white-gray quartz/feldspar and reddish-brown hematite/goethite staining. Likely hardness about 6–7, vitreous to dull luster, no obvious cleavage in quartz; density commonly 2.6–2.8 g/cm³.
Formation & geological history
Probably a weathered felsic igneous rock or metamorphic fragment formed from silica-rich magma, then altered and oxidized near the surface. The photograph cannot establish its geological age.
Uses & applications
Usually little commercial value as an isolated specimen; similar material is used as crushed aggregate, building stone, or occasionally as a decorative stone.
Geological facts
The rusty coloration is commonly caused by iron oxides coating fractures and grain boundaries, not necessarily by a high iron content throughout the rock.
Field identification & locations
Quartz-rich rocks are plausible around northern Oman, including the region near 23.7°N, 58.1°E, although local geology also includes ophiolitic rocks and sedimentary units. Check for visible interlocking crystals, a glass-scratching hardness, and lack of reaction to dilute hydrochloric acid; a magnet test may help detect magnetite.
