metamorphic

Banded quartzite pebble

Quartzite, predominantly quartz (SiO₂) with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray with rusty orange bands, vitreous to slightly dull luster, massive granular texture, and no obvious cleavage. The rounded shape indicates water or glacial abrasion.

Identified September 6, 2026More metamorphic →

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Physical properties

Hardness about 7 Mohs; pale gray with rusty orange bands, vitreous to slightly dull luster, massive granular texture, and no obvious cleavage. The rounded shape indicates water or glacial abrasion.

Formation & geological history

Formed when quartz-rich sandstone was recrystallized under heat and pressure, commonly during regional metamorphism; its exact geological age cannot be determined from the photograph. Orange coloration is likely hematite or limonite staining along former bedding or fractures.

Uses & applications

Useful as durable aggregate, landscaping stone, paving material, and decorative or tumbled stone; this small specimen has minimal commercial value.

Geological facts

Quartzite commonly preserves faint original sedimentary banding while becoming harder and more fused than sandstone. It can resemble chert, but typically has a sugary crystalline texture and scratches ordinary glass.

Field identification & locations

Common in metamorphic mountain belts and river or glacial gravels worldwide. Test identification by attempting to scratch glass and examining a fresh surface for interlocking quartz grains; acid produces no fizz.