metamorphic
Quartzite (Quartz Pebble)
Quartzite (SiO2 with iron oxide inclusions)
Hardness: 7 on Mohs scale. Color: Pinkish-orange to white and gray due to iron staining. Luster: Vitreous to dull/waxy on weathered surfaces. Structure: Microcrystalline, granular, non-foliated. Cleavage: None. Specific Gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Color
- Pinkish-orange to white and gray due to iron staining
- Luster
- Vitreous to dull/waxy on weathered surfaces
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Physical properties
Hardness: 7 on Mohs scale. Color: Pinkish-orange to white and gray due to iron staining. Luster: Vitreous to dull/waxy on weathered surfaces. Structure: Microcrystalline, granular, non-foliated. Cleavage: None. Specific Gravity: ~2.65.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure within the Earth's crust. The rounded pebble shape indicates secondary erosion and transport by rivers, streams, or glacial activity.
Uses & applications
Commonly used in landscaping, road aggregate, ballast, river rocks decor, and occasionally for lapidary tumbling or educational rock collections.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering. When sandstone metamorphoses into quartzite, individual quartz grains recrystallize, interlocking tightly so the rock fractures across grains rather than around them.
Field identification & locations
Identified by its high hardness (scratches glass), sugary/crystalline texture, and rounded water-worn exterior with reddish iron staining. Found globally in riverbeds, beaches, and glacial till deposits.
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