metamorphic

Pink Quartzite Pebble

Quartzite (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale), Color: Pink/Rose due to hematite or manganese impurities, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.7. It is characterized by a sugary, grainy texture where the original sand grains have fused together.

Identified July 16, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartzite is a non-foliated metamorphic rock that forms when quartz-rich sandstone is subjected to high heat and pressure, typically during regional metamorphism at convergent plate boundaries. This specific specimen appears to be water-worn, indicating a recent history in a fluvial or beach environment.

Uses & applications

Larger deposits are used for railway ballast, construction aggregate, and countertops. Small pink pebbles are frequently used in decorative landscaping, succulent gardening, and as aquarium substrate. High-purity quartzite is a source of silica for glass and silicon metal production.

Geological facts

Quartzite is so hard and chemically resistant that it often forms the caps of hills and ridges because it resists weather better than the surrounding stone. In many cases, it is harder than the steel of a masonry drill bit.

Field identification & locations

Identify in the field by its extreme hardness (it will easily scratch glass) and its tendency to break across the sand grains rather than around them (conchoidal fracture). It is common in ancient mountain belts and glaciated regions.