metamorphic

Green Quartzite (Aventurine-like)

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale); Color: Pale green to grey-green with brownish iron staining; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.6-2.65

Hardness: 7 (Mohs scale)
Color: Pale green to grey-green with brownish iron staining
Luster: Vitreous to waxy

Identified April 16, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure. The green color is typically caused by inclusions of chrome-rich mica (fuchsite). These specimens are often hundreds of millions of years old.

Uses & applications

Used primarily for decorative purposes, lapidary work (tumbling/polishing), garden landscaping, and as a semi-precious stone in jewelry.

Geological facts

Quartzite is so hard that it will scratch glass and even steel. When it contains mica inclusions that create a shimmering effect, it is specifically called Aventurine.

Field identification & locations

Identify in the field by its hardness (it should easily scratch a penny or a steel knife blade) and its granular, sugary texture. Often found as rounded pebbles on beaches or in riverbeds near metamorphic belts.