Green Quartzite (Aventurine-like)

Physical Properties

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

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.

Identified on: 4/16/2026

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