metamorphic
Pink Quartzite
Quartzite (SiO2)
Hardness: 7 (Mohs scale), Color: Pinkish-grey to lavender with white mottled inclusions, Luster: Vitreous to dull, Crystal structure: Granoblastic, Cleavage: Indistinct/Conchoidal fracture, Specific gravity: 2.6-2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Pinkish-grey to lavender with white mottled inclusions, Luster: Vitreous to dull, Crystal structure: Granoblastic, Cleavage: Indistinct/Conchoidal fracture, Specific gravity: 2.6-2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically in orogenic belts. This smooth, rounded specimen indicates significant transport and erosion by water (fluvial or beach action).
Uses & applications
Used as a decorative stone, in construction as crushed stone for road beds or railway ballast, and occasionally for lapidary work or aquarium gravel.
Geological facts
Quartzite is so tough and resistant to chemical weathering that it often forms the tops of ridges and mountains. It is harder than the steel of a pocket knife, which will leave a metallic streak on the stone rather than scratching it.
Field identification & locations
Identify in the field by its extreme hardness and grainy, 'sugary' texture on fresh fractures. Commonly found in ancient mountain ranges and glacial till. Collectors look for unique banding or intense coloration.
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