metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 (Mohs), Color: White to yellowish-tan due to iron staining, Luster: Vitreous to dull when weathered, Structure: Granoblastic (interlocking quartz grains), Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs), Color: White to yellowish-tan due to iron staining, Luster: Vitreous to dull when weathered, Structure: Granoblastic (interlocking quartz grains), Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under extreme heat and pressure. This specific specimen has been rounded by river or beach water transport over thousands of years.
Uses & applications
Commonly used in construction aggregate, as a decorative stone in landscaping, or as a raw material for glass manufacturing.
Geological facts
Quartzite is so durable that it often survives intense weathering that destroys other rocks. It can break through the quartz grains rather than around them, unlike sandstone.
Field identification & locations
Identify in the field by its hardness (it will easily scratch glass) and the way it resists breaking along grain boundaries. Found globally in mountainous regions and riverbeds.
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