metamorphic
Quartzite with Hematite
Metamorphic Quartzite (SiO2 with Fe2O3 inclusions)
Hardness 7 on Mohs scale; Color: white to light gray with reddish-brown staining; Luster: vitreous to waxy; Texture: granular and crystalline; Cleavage: none (conchoidal fracture).
- Color
- white to light gray with reddish-brown staining
- Luster
- vitreous to waxy
Identified More metamorphic →
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Physical properties
Hardness 7 on Mohs scale; Color: white to light gray with reddish-brown staining; Luster: vitreous to waxy; Texture: granular and crystalline; Cleavage: none (conchoidal fracture).
Formation & geological history
Formed through the metamorphism of quartz sandstone. Intense heat and pressure caused the original quartz grains to recrystallize. The red coloration is due to the presence of iron oxide (hematite) staining, occurring over millions of years.
Uses & applications
Commonly used as crushed stone in road construction, railroad ballast, and as a decorative stone in landscaping. High-quality specimens are sometimes used for interior countertops or as architectural stone.
Geological facts
Quartzite is so tough that it often survives the intense erosion of rivers and beaches long after other rocks have worn away. This specific piece shows a water-worn, rounded shape, indicating it was likely transported by water.
Field identification & locations
Identify by its ability to scratch glass and its granular, sugary appearance inside. It is found globally, particularly in areas with ancient mountain ranges or riverbeds.
