metamorphic
Quartzite with Quartz Vein
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Pinkish-tan to reddish-brown with a white vein; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- Pinkish-tan to reddish-brown with a white vein
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Pinkish-tan to reddish-brown with a white vein; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7.
Formation & geological history
Quartzite is formed through the metamorphism of quartz sandstone under high heat and pressure. The white vein suggests a later hydrothermal process where silica-rich fluid filled a fracture and crystallized into quartz. This specimen is a water-worn river stone or pebble.
Uses & applications
Commonly used in construction as crushed stone or ballast. High-purity quartzite is used to produce silica for glass making and metallurgy. Rounded pebbles are popular for landscaping and decorative garden features.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rock during weathering, creating prominent ridges. This specific specimen is known as a 'Wishing Stone' in folklore because of the continuous white band circling it.
Field identification & locations
Identify in the field by its hardness (it will scratch glass and steel) and its granular, sugary texture. This water-rounded cobble is typical of glacial till or river bed deposits throughout North America and Europe.
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