metamorphic
Green Quartzite (with Hematite inclusions)
Metamorphic Quartz (SiO2) with various inclusions
Hardness: 7 (Mohs); Color: Pale green with reddish-brown spots; Luster: Vitreous to waxy; Texture: Granular and microcrystalline; Grainy appearance when fractured.
- Hardness
- 7 (Mohs)
- Color
- Pale green with reddish-brown spots
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs); Color: Pale green with reddish-brown spots; Luster: Vitreous to waxy; Texture: Granular and microcrystalline; Grainy appearance when fractured.
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure, typically during mountain-building events. The green tint is often caused by fuchsite (chrome-mica) or chlorite, while the red spots are hematite (iron oxide).
Uses & applications
Used in construction for road ballast and flooring, as a decorative stone in landscaping, and sometimes as a minor gemstone for cabochons.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks in a landscape, forming the caps of hills and ridges. It is often confused with marble but is much harder and will scratch glass.
Field identification & locations
Identify by its extreme hardness (cannot be scratched by steel) and lack of reaction to acid. Look for it in glaciated areas or riverbeds near ancient mountain ranges.
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