metamorphic
Quartzite with inclusions
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: White to light grey with green/grey mineral inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.63-2.65
- Hardness
- 7 on Mohs scale
- Color
- White to light grey with green/grey mineral inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: White to light grey with green/grey mineral inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.63-2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during mountain-building events. The rounded shape suggests it was weathered and smoothed by water transport in a river or glacial environment.
Uses & applications
Used in construction as a decorative stone, road ballast, and in the manufacturing of glass or ceramics. Smooth river stones are popular in landscaping and as 'worry stones' for collectors.
Geological facts
Quartzite is so hard that it will scratch glass and steel. It is often more durable than the parent sandstone it originated from, making it highly resistant to chemical weathering.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a knife) and crystalline, sugary texture when broken. Commonly found in riverbeds, glacial tills, and ancient mountain ranges worldwide.
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