Orange Quartzite / Carnelian Agate

Physical Properties

Hardness: 7 (Mohs scale), Color: Orange to honey-brown, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6 – 2.7

Formation & Geological History

Formed through the metamorphism of quartz-rich sandstone under heat and pressure, or as a secondary mineral precipitation (agate/chalcedony) in volcanic rock cavities. This specimen appears water-worn, likely from a river or beach environment.

Uses & Applications

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

Geological Facts

Orange varieties of quartz-based rocks get their color from metabolic iron impurities (hematite or goethite). When it is translucent chalcedony, it is specifically called Carnelian.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lack of visible grains if metamorphic, and smooth, rounded surface indicating erosion. Found globally in alluvial deposits and regions with high tectonic activity.

Identified on: 4/13/2026

Mode: Standard