metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 (Mohs scale), Color: Brownish-tan with reddish iron staining, Luster: Dull/waxy (weathered), Structure: Granular/crystalline, Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: Brownish-tan with reddish iron staining, Luster: Dull/waxy (weathered), Structure: Granular/crystalline, Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz sandstone under high heat and pressure, typically during mountain-building events. This specimen is a water-worn river cobble.
Uses & applications
Used in construction as a high-quality aggregate, in road metal, and as a durable material for pathways or landscaping.
Geological facts
Quartzite is so hard it can easily scratch glass and even steel. Its color is influenced by impurities; the reddish tint in this sample is likely due to hematite or goethite (iron oxides).
Field identification & locations
Found throughout the Alps and Styrian Basin rivers (near Maribor, Slovenia area). Identify by its extreme hardness and lack of reaction to acid. It is much harder than limestone (calcite).
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