metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: white to off-white; Luster: vitreous to dull; Crystal structure: trigonal (microcrystalline); Cleavage: none; Specific gravity: 2.63-2.65
- Hardness
- 7 on Mohs scale
- Color
- white to off-white
- Luster
- vitreous to dull
Identified More metamorphic →
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Physical properties
Hardness: 7 on Mohs scale; Color: white to off-white; Luster: vitreous to dull; Crystal structure: trigonal (microcrystalline); Cleavage: none; Specific gravity: 2.63-2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. This specimen shows signs of fluvial erosion (rounded edges from water transport).
Uses & applications
Commonly used in construction as crushed stone, for railroad ballast, and occasionally for primitive tools in ancient times due to its durability.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, often capping mountains or forming prominent outcrops. It is harder than steel.
Field identification & locations
Identify in the field by its hardness (it will scratch glass easily) and its sugary, crystalline fracture surface. It is ubiquitously found in riverbeds and glacial deposits.
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