Jasper with Epidote (Unakite-related)

Physical Properties

Hardness: 6-7 (Mohs scale); Color: Mottled green (epidote) and reddish-brown to orange (feldspar/iron oxides); Luster: Vitreous to dull; Crystal structure: Microcrystalline; Cleavage: None/Conchoidal fracture.

Formation & Geological History

Formed through the hydrothermal metamorphism of granitic rocks, where plagioclase feldspar is replaced by epidote. This process occurred during various mountain-building events (orogenies) globally.

Uses & Applications

Used primarily as a gemstone for cabochons, beads, and carvings. Also used as a decorative stone for architectural features and landscaping.

Geological Facts

This specimen appears to be a river-worn pebble. While similar to Unakite, the dominance of green epidote and iron staining suggests it is a high-epidote metamorphic jasper, often found in glacial till.

Field Identification & Locations

Identify in the field by its distinct green and orange/red mottling and its high hardness (it will scratch glass). Commonly found in riverbeds and on beaches in the Great Lakes region and the Appalachian Mountains.

Identified on: 5/19/2026

Mode: Standard