Auriferous Quartz (Gold-bearing Quartz)

Physical Properties

Hardness: 7 (quartz) vs 2.5 (gold); Color: White/milky quartz with yellow metallic inclusions and rusty iron stains; Luster: Vitreous to greasy; Structure: Hexagonal (quartz); No cleavage; Specific Gravity: 2.65 (quartz), 19.3 (gold).

Formation & Geological History

Formed in hydrothermal veins through precipitation from hot, mineral-rich fluids deep in the Earth's crust, often during orogenic (mountain-building) events.

Uses & Applications

Primary source for commercial gold mining; decorative specimens for collectors; historical significance in jewelry representing 'the gold rush'.

Geological Facts

Gold and quartz are frequently found together because gold is chemically inert and remains in solution with silica until temperature and pressure changes cause them to deposit simultaneously.

Field Identification & Locations

Identify by looking for vitreous quartz veins hosted in darker country rock with metallic yellow specks that do not shatter when poked (unlike pyrite). Commonly found in California, Alaska, Australia, and South Africa.

Identified on: 5/6/2026

Mode: Standard