metamorphic
Green Quartzite
Quartzite (primarily SiO2 with inclusions)
Hardness: 7 on Mohs scale; Color: Greenish-grey with iron staining; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal (granular); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
- Hardness
- 7 on Mohs scale
- Color
- Greenish-grey with iron staining
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Greenish-grey with iron staining; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal (granular); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure. The green coloration often comes from trace minerals like fuchsite or chlorite. This specimen appears weathered with surface oxidation (iron staining).
Uses & applications
Used in construction as crushed stone or decorative facing, in landscaping, and sometimes as a minor gemstone if the color is vibrant (Aventurine).
Geological facts
Quartzite is so tough that it often breaks through the constituent quartz grains rather than around them, unlike sandstone. It is highly resistant to chemical weathering.
Field identification & locations
Identify in the field by its hardness (it will easily scratch glass) and lack of reaction to acid. Look for a sugary, granular texture on fresh breaks. Common in ancient mountain belts.
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