metamorphic
Quartzite with inclusions
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: white/cream with grey/greenish banding; Luster: vitrious to dull; Crystal structure: Trigonal (granular texture); Cleavage: none (fractures across grains); Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- white/cream with grey/greenish banding
- Luster
- vitrious to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: white/cream with grey/greenish banding; Luster: vitrious to dull; Crystal structure: Trigonal (granular texture); Cleavage: none (fractures across grains); Specific gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically in orogenic belts. This specific specimen shows water-worn rounding and distinct mineral banding from original sedimentary layers.
Uses & applications
Quartzite is used heavily in construction as crushed stone, for floor tiles, and high-quality specimens are used for countertops or as decorative lapidary material.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks in mountainous areas, forming prominent ridges and peaks. It is frequently mistaken for marble but is much harder and will not react with acid.
Field identification & locations
Identify in the field by its inability to be scratched by a steel nail and its grainy, sugary texture. Common in ancient mountain ranges like the Appalachians or the Alps.
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