mineral
Native gold-bearing quartz/rock fragment
Native gold (Au), likely in quartz or iron-oxide matrix
AI-generated identification · may be incorrectSmall irregular specimen with bright brassy-yellow metallic patches and a mottled pale matrix. Native gold has Mohs hardness 2.5–3, very high density (~19.3), metallic luster, malleability, and no cleavage; the matrix may be quartz (hardness 7) and limonite/iron oxides.
Identified More mineral →
Explore Native gold-bearing quartz/rock fragment in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Small irregular specimen with bright brassy-yellow metallic patches and a mottled pale matrix. Native gold has Mohs hardness 2.5–3, very high density (~19.3), metallic luster, malleability, and no cleavage; the matrix may be quartz (hardness 7) and limonite/iron oxides.
Formation & geological history
Likely formed in hydrothermal quartz veins when gold-bearing fluids deposited native gold in fractures, commonly during mountain-building; exact age and locality cannot be determined from the image.
Uses & applications
Gold is used in jewelry, electronics, dentistry, and investment; quartz-gold specimens are collectible. Value depends overwhelmingly on verified gold weight and fineness.
Geological facts
Gold’s yellow streak and malleability distinguish it from pyrite, which is harder and brittle. The image alone cannot confirm that the yellow material is gold.
Field identification & locations
Test with a loupe, streak test, density, and professional assay; gold will dent or smear rather than crumble. Common sources include Nevada, California, Australia, Canada, and South Africa.
