metamorphic
Weathered quartz-rich rock, likely feldspathic quartzite or quartz vein fragment
Quartzite dominated by quartz (SiO₂), with probable feldspar and iron-oxide staining
AI-generated identification · may be incorrectHardness about 7 (quartz), white to honey-brown, translucent in thin edges, with vitreous to dull luster and irregular fracture; brown color likely comes from limonite/goethite coatings. Crystalline texture is granular, though the photograph is insufficient to confirm quartzite versus a weathered quartz vein.
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Physical properties
Hardness about 7 (quartz), white to honey-brown, translucent in thin edges, with vitreous to dull luster and irregular fracture; brown color likely comes from limonite/goethite coatings. Crystalline texture is granular, though the photograph is insufficient to confirm quartzite versus a weathered quartz vein.
Formation & geological history
Likely formed when quartz-rich sandstone recrystallized during metamorphism, or precipitated in a hydrothermal fracture; age depends on its source region and cannot be determined visually. Iron-bearing groundwater later produced the ochre staining.
Uses & applications
Quartzite is used as crushed stone, aggregate, road material, building stone, and occasionally decorative material; attractive stained pieces are collected but generally have modest value.
Geological facts
Quartzite is commonly harder and more resistant to weathering than its parent sandstone. A steel file should not readily scratch the fresh surface, while glass can usually be scratched by it.
Field identification & locations
Common in metamorphic belts and quartz-vein zones worldwide; test with a hand lens, streak, and hardness test, and look for fused quartz grains rather than visible sand grains. Acid reaction should be absent unless carbonate minerals are present.
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