metamorphic
Green Quartzite (Aventurine type)
Quartzite (principally Quartz, SiO2) with inclusions of Fuchsite
Hardness: 7 (Mohs scale), Color: Pale green to grey-green, Luster: Vitreous to waxy, Structure: Granular/Microcrystalline, Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 7 (Mohs scale), Color: Pale green to grey-green, Luster: Vitreous to waxy, Structure: Granular/Microcrystalline, Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the regional metamorphism of quartz-rich sandstone. The green tint is often provided by the presence of chromium-rich mica (fuchsite) during intense heat and pressure in tectonic zones.
Uses & applications
Used primarily for decorative stones, landscaping, tumbled stones for metaphysical use, and sometimes as low-grade gemstones or for building facades.
Geological facts
Quartzite is so hard that it will scratch glass and steel. Green varieties are often mistaken for jade, but are much more common and exhibit a granular texture under magnification.
Field identification & locations
Identify by its hardness (it cannot be scratched by a knife) and its grainy, sugary texture. Common in ancient mountain belts like the Appalachians or the Himalayas.
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