metamorphic
Green Quartzite
Quartzite (SiO2)
Hardness: 7 on Mohs scale; Color: Pale green to sage green; Luster: Vitreous to dull; Crystal structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 to 2.7.
- Hardness
- 7 on Mohs scale
- Color
- Pale green to sage green
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Pale green to sage green; Luster: Vitreous to dull; Crystal structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6 to 2.7.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone subjected to high heat and pressure, causing recrystallization. Often associated with Precambrian or Paleozoic geological eras.
Uses & applications
Used as decorative stone in landscaping, crushed stone for road construction, and occasionally for lapidary work or polishing as pocket stones.
Geological facts
Quartzite is so durable that it can outlast the surrounding softer rocks, often forming the peaks of hills and mountains. The green color is typically caused by the presence of inclusions like fuchsite (a green mica) or chlorite.
Field identification & locations
Identify in the field by its superior hardness (cannot be scratched by a steel nail) and its granular, sugary texture on fresh surfaces. Commonly found in metamorphic belts like the Appalachians, Alps, or Canadian Shield.
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