metamorphic
Beach Quartzite Pebble
Quartzite (primarily SiO2)
Hardness: 7 on Mohs scale; Color: tan to light orange/pink; Luster: vitreous to waxy (especially when wet); Crystal structure: non-foliated, granular; Specific gravity: approx 2.65.
- Hardness
- 7 on Mohs scale
- Color
- tan to light orange/pink
- Luster
- vitreous to waxy (especially when wet)
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Physical properties
Hardness: 7 on Mohs scale; Color: tan to light orange/pink; Luster: vitreous to waxy (especially when wet); Crystal structure: non-foliated, granular; Specific gravity: approx 2.65.
Formation & geological history
Formed from the metamorphism of quartz sandstone under intense heat and pressure. This specific specimen has been further shaped by fluvial or marine erosion, resulting in its smooth, rounded 'water-worn' appearance.
Uses & applications
Commonly used in construction as crushed stone or ballast. Rounded pebbles are frequently used in decorative landscaping, aquariums, and occasionally in lapidary work for rock tumbling.
Geological facts
Quartzite is harder than the parent sandstone and often harder than steel. Its color often comes from impurities like iron oxide (hematite), which gives it an orange or reddish hue.
Field identification & locations
Identify by its ability to scratch glass and its grainy, sugary texture visible under a lens. Found globally on beaches and in riverbeds where erosion has transported material from metamorphic uplands.
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