mineral
Quartz-rich gold-bearing rock (possible quartz vein ore)
Hydrothermal quartz vein; predominantly SiO₂, with possible iron oxides/sulfides and minor native gold
AI-generated identification · may be incorrectWhite to gray, granular/vuggy quartz with rusty yellow-brown staining and dark matrix; quartz hardness ~7, vitreous luster, no cleavage, hexagonal crystal structure, specific gravity ~2.65. The metallic yellow areas may be pyrite or weathered sulfides rather than gold; image alone cannot confirm.
Identified More mineral →
Explore Quartz-rich gold-bearing rock (possible quartz vein ore) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
White to gray, granular/vuggy quartz with rusty yellow-brown staining and dark matrix; quartz hardness ~7, vitreous luster, no cleavage, hexagonal crystal structure, specific gravity ~2.65. The metallic yellow areas may be pyrite or weathered sulfides rather than gold; image alone cannot confirm.
Formation & geological history
Likely formed when silica-rich hydrothermal fluids filled fractures and deposited quartz plus sulfide minerals in bedrock, commonly during Precambrian to younger mountain-building events; exact age and locality require testing.
Uses & applications
Quartz vein material is mainly a collector specimen or possible assay ore; associated gold, if present, has jewelry and monetary value. It has little construction value as an isolated hand specimen.
Geological facts
Brassy pyrite (“fool’s gold”) is angular, brittle, and often tarnishes, while native gold is soft, malleable, and remains yellow; visible gold cannot be reliably identified from a photograph.
Field identification & locations
Common in gold districts worldwide, including Nevada, California, Australia, Canada, and South Africa. Test with a streak plate, hardness, density, magnetism, and professional fire assay; do not crush without safety precautions.
