metamorphic
Quartzite
Quartzite (primarily SiO2)
Hardness: 7 (Mohs); Color: white to off-white; Luster: vitreous to dull; Crystal structure: hexagonal (as quartz grains); Cleavage: none; Specific gravity: approx. 2.65
- Hardness
- 7 (Mohs)
- Color
- white to off-white
- Luster
- vitreous to dull
Identified More metamorphic →
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Physical properties
Hardness: 7 (Mohs); Color: white to off-white; Luster: vitreous to dull; Crystal structure: hexagonal (as quartz grains); Cleavage: none; Specific gravity: approx. 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. The specimen shown is a water-worn river or glacial pebble.
Uses & applications
Used as a decorative stone, in construction as crushed stone for road ballast, and as a source of silica in glass manufacturing.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, often forming the caps of ridges and mountains. This specific pebble likely originated from the Carpathian mountain range or glacial deposits common in Southeastern Poland.
Field identification & locations
Identify by its ability to scratch glass and its granular, sugary texture. Common in riverbeds (like the San or Wisłok rivers) and glacial till throughout the region of 50.0°N, 22.9°E.
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