metamorphic
Quartzite with Iron Inclusions
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: white to off-white with brownish-red iron staining; Luster: dull to vitreous; Crystal structure: Trigonal (granular texture); Cleavage: none; Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- white to off-white with brownish-red iron staining
- Luster
- dull to vitreous
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Physical properties
Hardness: 7 on Mohs scale; Color: white to off-white with brownish-red iron staining; Luster: dull to vitreous; Crystal structure: Trigonal (granular texture); Cleavage: none; Specific gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under high heat and pressure, often in orogenic (mountain-building) belts. These rocks can date back hundreds of millions of years.
Uses & applications
Used in construction as crushed stone, road ballast, and decorative landscaping. Also serves as a source of silica for glass manufacturing.
Geological facts
Quartzite is so hard that it can scratch steel and glass. The red/brown 'veins' seen in this specimen are caused by iron oxide (hematite or limonite) seeping into fractures.
Field identification & locations
Identify by its ability to scratch glass and its granular, sugary appearance on fresh surfaces. This specimen appears water-worn, likely found in a riverbed or on a beach.
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