metamorphic
Pink Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 (Mohs scale), Color: Pink/Peach/Tan, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: Pink/Peach/Tan, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.7
Formation & geological history
Formed via regional metamorphism of quartz-rich sandstone. High heat and pressure causes recrystallization of original quartz grains into a dense, interlocking mosaic of crystals.
Uses & applications
Used as decorative garden stone, in landscaping, as an abrasive, and occasionally for lapidary work such as tumbling and cabbing.
Geological facts
Quartzite is so tough that it often survives extensive weathering that destroys surrounding rocks, resulting in the smooth, rounded pebbles frequently found in riverbeds and glacial deposits.
Field identification & locations
Identify by its extreme hardness (cannot be scratched by a steel knife) and grainy, sugar-like texture on unpolished surfaces. Commonly found in areas with metamorphic basement rock or glacial outwash.
