Chalcedony (Agate/Carnelian variant)

Physical Properties

Hardness: 6.5-7 (Mohs scale), Color: Pale orange to waxy translucent yellow, Luster: Waxy to vitreous, Crystal structure: Microcrystalline (trigonal), Cleavage: None/Conchoidal fracture, Specific gravity: 2.6

Formation & Geological History

Formed through the deposition of silica from groundwater in cavities of igneous rocks or sedimentary layers. Primarily formed during volcanic activity or through low-temperature hydrothermal processes.

Uses & Applications

Used widely in jewelry (beads, cabochons), ornamental stone carvings, and as a semi-precious collector's specimen. Historically used for making tools and seals.

Geological Facts

This specimen shows the typical waxy 'orange-peel' texture and translucency of chalcedony. The name 'chalcedony' comes from the ancient Greek town of Chalkedon.

Field Identification & Locations

Identify in the field by its waxy luster, lack of visible crystals, and conchoidal (shell-like) fracture pattern. Commonly found in riverbeds, desert pavements, and volcanic regions.

Identified on: 4/20/2026

Mode: Standard