Pyrite Geode (Sparkling Druzy)

Physical Properties

Hardness: 6-6.5 (Pyrite) / 7 (Quartz/Chalcedony host); Color: Brass-yellow metallic crystals inside dark gray to black host rock; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral crystals); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & Geological History

Formed through the deposition of iron and sulfur in cavities or gas bubbles within sedimentary or volcanic rocks. These often occur in shale or limestone where organic matter is decomposing in an oxygen-poor environment.

Uses & Applications

Primarily used as a decorative specimen for collectors, in holistic practices (healing crystals), and occasionally in jewelry as marcasite-style focal points.

Geological Facts

Pyrite is famously known as 'Fool's Gold' because of its metallic luster and yellow hue. Unlike real gold, it is brittle and will leave a greenish-black streak when rubbed on a porcelain plate.

Field Identification & Locations

Identify by its heavy weight for its size, metallic brassy glint inside the hollow, and the dark, often round exterior 'rind'. Commonly found in sedimentary basins and mining districts globally.

Identified on: 5/5/2026

Mode: Standard