metamorphic
Green Quartzite
Quartzite with Fuchsite or Chlorite inclusions
Hardness: 7 (Mohs scale); Color: Pale green to greyish-green; Luster: Vitreous to dull; Crystal structure: Trigonal (granular texture); Cleavage: None; Specific gravity: 2.6-2.7
- Hardness
- 7 (Mohs scale)
- Color
- Pale green to greyish-green
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Mohs scale); Color: Pale green to greyish-green; Luster: Vitreous to dull; Crystal structure: Trigonal (granular texture); Cleavage: None; Specific gravity: 2.6-2.7
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. Under intense heat and pressure, quartz grains recrystallize and fuse together, often incorporating mica or chlorite which provides the green tint.
Uses & applications
Used as decorative stone, crushed stone for road construction, floor tiles, and occasionally in lapidary for carvings or cabochons.
Geological facts
Quartzite is so tough that it often breaks through the quartz grains rather than along their boundaries, unlike its parent rock sandstone. The green color is frequently caused by trace amounts of chromium-rich mica known as fuchsite.
Field identification & locations
Identify in the field by its extreme hardness (it will easily scratch glass) and its sugary, granular texture. Found in mountainous or formerly mountainous regions globally like the Appalacians or Himalayas.
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