metamorphic
Quartzite Pebble
Quartzite (SiO2-rich metamorphic rock)
Hardness: ~7 on Mohs scale; Color: grayish-tan to off-white with earthy weathering; Luster: vitreous to dull/earthy; Crystal structure: granular, interlocking quartz grains; Cleavage: none (conchoidal to uneven fracture).
- Hardness
- ~7 on Mohs scale
- Color
- grayish-tan to off-white with earthy weathering
- Luster
- vitreous to dull/earthy
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Physical properties
Hardness: ~7 on Mohs scale; Color: grayish-tan to off-white with earthy weathering; Luster: vitreous to dull/earthy; Crystal structure: granular, interlocking quartz grains; Cleavage: none (conchoidal to uneven fracture).
Formation & geological history
Formed through the regional or contact metamorphism of quartz-rich sandstone under intense heat and pressure, causing quartz grains to recrystallize and interlock tightly.
Uses & applications
Commonly used in construction aggregate, landscaping, road base, and as a durable natural stone material. Small rounded pebbles are used decoratively or in aquariums.
Geological facts
Quartzite is so hard and compact that when it breaks, the fracture cuts directly through the quartz grains rather than around them, unlike sandstone.
Field identification & locations
Identified by its high hardness (scratches glass easily), sugary/granular quartz texture, and extreme resistance to weathering. Commonly found in riverbeds, glacial deposits, and mountain ranges globally.
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