Quartzite with Chlorite/Epidote

Physical Properties

Hardness: 7 (Mohs), Color: Light grey to greenish-grey, Luster: Vitreous to dull, Crystal structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.6-2.7

Formation & Geological History

Formed through the regional metamorphism of quartz sandstone. The greenish tint suggests the presence of chlorite or epidote minerals, typically forming in low to medium-grade metamorphic environments.

Uses & Applications

Used in construction as crushed stone, road ballast, or decorative landscaping rock. Fine specimens may be used for lapidary work.

Geological Facts

Quartzite is so tough that it often outlasts the surrounding rocks during weathering, frequently appearing on ridges or as rounded river cobbles like this specimen.

Field Identification & Locations

Identify by its ability to scratch glass and its granular, sugary texture. Common in ancient mountain belts and glacial till. This specimen shows water-worn rounding.

Identified on: 5/2/2026

Mode: Standard