metamorphic
Green Quartzite (or Green Jasper)
Silica (Silicon Dioxide, SiO2) with inclusions
Hardness: 6.5-7 (Mohs scale), Color: Dull pale green to sage green, Luster: Waxy to earthy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Dull pale green to sage green, Luster: Waxy to earthy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture)
Formation & geological history
Quartzite forms through the metamorphism of quartz sandstone under intense heat and pressure. The green coloration often comes from trace minerals like chlorite, fuchsite, or epidote. These specimens are often millions of years old.
Uses & applications
Commonly used as decorative stones, in landscaping, and as river rock. Higher quality green jasper or quartzite is used for tumbling and lapidary work.
Geological facts
The green color is typically an impurity; pure quartz is clear. When found as river stones, they have been naturally tumbled and smoothed by water action over centuries.
Field identification & locations
Identify in the field by its hardness (will scratch glass) and its smooth, rounded river-worn texture. It is often found in riverbeds or coastal areas with high volcanic or metamorphic activity.
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