metamorphic
Weathered iron-rich rock, possibly hematite-bearing quartzite
Quartzite with iron oxides (quartz, hematite/goethite); exact identification requires testing
AI-generated identification · may be incorrectDark reddish-brown, earthy to submetallic luster, granular texture, and no obvious cleavage; likely hardness about 6–7 Mohs, with moderate-to-high specific gravity from iron oxides.
Identified More metamorphic →
Explore Weathered iron-rich rock, possibly hematite-bearing quartzite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Dark reddish-brown, earthy to submetallic luster, granular texture, and no obvious cleavage; likely hardness about 6–7 Mohs, with moderate-to-high specific gravity from iron oxides.
Formation & geological history
Likely formed when quartz-rich sediment was metamorphosed and later stained or cemented by oxidized iron-bearing fluids; age and precise geological setting cannot be determined from the photograph.
Uses & applications
Primarily a specimen or field sample; iron-rich quartzite may be used as crushed aggregate or decorative stone, while hematite-rich material can be an iron ore.
Geological facts
The reddish-brown coloration commonly comes from hematite or goethite coatings rather than the main rock matrix. A streak test and acid/magnet tests would help distinguish quartzite from ironstone or weathered basalt.
Field identification & locations
Common in weathered terrains and iron-rich formations worldwide, including Australia, Brazil, India, and the United States; quartz grains and a glassy fracture suggest quartzite, while a red-brown streak suggests hematite.
More like this
