metamorphic
Green Quartzite Pebble
Quartzite (SiO2 with chlorite/fuchsite inclusions)
Hardness: 7 (Mohs scale); Color: Pale green to seafoam green; Luster: Vitreous to dull/waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.63-2.65
- Hardness
- 7 (Mohs scale)
- Color
- Pale green to seafoam green
- Luster
- Vitreous to dull/waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Pale green to seafoam green; Luster: Vitreous to dull/waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.63-2.65
Formation & geological history
Quartzite forms from the metamorphism of quartz-rich sandstone. Under high heat and pressure, quartz grains recrystallize and fuse together. The green tint is often caused by micro-inclusions of green minerals like chlorite or fuchsite (a chrome-rich mica).
Uses & applications
Commonly used as decorative landscaping stone, in construction as crushed stone, or polished as a pocket stone for collectors.
Geological facts
Quartzite is one of the most durable rocks on Earth, often surviving long periods of erosion that wear away surrounding softer rocks. It is frequently mistaken for jade by amateur collectors.
Field identification & locations
Identified in the field by its superior hardness (it will scratch glass) and lack of obvious grains compared to sandstone. Often found in riverbeds or coastal areas as rounded water-worn pebbles.
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