Quartz with Pyrite inclusions

Physical Properties

Hardness: 7 (Quartz) / 6-6.5 (Pyrite). Color: Milky to translucent white with metallic brassy-gold spots. Luster: Vitreous to greasy on quartz, metallic on pyrite. Crystal structure: Hexagonal/Trigonal. Cleavage: None (conchoidal fracture).

Formation & Geological History

Formed through hydrothermal processes where mineral-rich hot water circulates through crustal fractures. Pyrite crystals often grow alongside or inside the quartz as the solution cools and crystallizes.

Uses & Applications

Primarily used for geological collecting and as a indicator mineral for gold prospecting. Pure quartz is used in glassmaking and electronics; pyrite is used for sulfuric acid production but is mostly a specimen mineral here.

Geological Facts

Pyrite is known as 'Fool\'s Gold' because its color and metallic luster frequently lead novice prospectors to mistake it for genuine gold. Quartz is the second most abundant mineral in Earth\'s continental crust.

Field Identification & Locations

Identify in the field by the quartz\'s ability to scratch glass and the pyrite\'s metallic, cubic structure. Found commonly in mountainous regions and near mining districts or quartz veins.

Identified on: 4/14/2026

Mode: Standard