metamorphic
Quartz-rich iron-stained rock, likely quartzite or quartz vein material
Quartz (SiO₂), with iron oxides/hydroxides such as hematite and goethite
AI-generated identification · may be incorrectHardness about 7 Mohs; white to translucent gray quartz with rusty orange-brown staining, vitreous to dull luster, granular or massive texture, and no obvious cleavage. The surface appears weathered and may include minor feldspar or host-rock fragments.
Identified More metamorphic →
Explore Quartz-rich iron-stained rock, likely quartzite or quartz vein material in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness about 7 Mohs; white to translucent gray quartz with rusty orange-brown staining, vitreous to dull luster, granular or massive texture, and no obvious cleavage. The surface appears weathered and may include minor feldspar or host-rock fragments.
Formation & geological history
Likely formed from quartz-rich sediment metamorphosed into quartzite, or precipitated as a hydrothermal quartz vein and later iron-stained by weathering. Its precise geological age cannot be determined from the photograph.
Uses & applications
Commonly used as aggregate, road stone, decorative stone, and occasionally as a lapidary material; generally not gem quality. Attractive polished pieces may have modest collecting value.
Geological facts
Iron oxides create the orange, brown, and reddish colors by filling fractures and coating quartz grains. Quartz should scratch ordinary glass, while a steel knife typically does not scratch it.
Field identification & locations
Common in quartz veins, metamorphic terrains, and gravel deposits worldwide; look for sugary granular texture, glassy translucent areas, and very high hardness. A field test, streak test, and acid test on associated material would improve identification.
More like this
