How to identify Gold in Quartz
Au in SiO2
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Open the appTo correctly identify Gold in Quartz (Au in SiO2), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.
Step-by-step identification
- 1
Color
Overall color and any zoning or banding
Gold: Bright metallic yellow, often with a slightly reddish or orange tint. Quartz: Typically colorless, white, milky, grey, or smoky.
- 2
Luster
How the surface reflects light: metallic, vitreous, dull
Gold: Distinctive metallic luster. Quartz: Vitreous (glassy) luster.
- 3
Texture
Grain size and surface feel: coarse, fine, glassy
Gold: Often occurs as irregular flakes, wires, dendrites, or small nuggets within the quartz. Quartz: Can be massive, granular, or crystalline.
- 4
Crystal Form
Shape of visible crystals or crystal faces
Gold: Typically anhedral to subhedral grains, flakes, or wires; rarely forms distinct crystals (octahedra, dodecahedra, cubes). Quartz: Hexagonal prisms with pyramidal terminations, or massive/granular.
- 5
Cleavage
How it breaks: flat cleavage planes vs irregular fracture
Gold: None (highly ductile and malleable). Quartz: None, exhibits conchoidal fracture.
- 6
Geological Environment
The rock formation and setting where it occurs
Hydrothermal veins, often associated with fault zones, shear zones, and intrusive igneous rocks in various tectonic settings (e.g., orogenic belts, epithermal systems).
Key Facts
- Hardness
- Gold: 2.5-3 (Mohs); Quartz: 7 (Mohs)
- Specific Gravity
- Gold: 19.3 (pure); Quartz: 2.65
- Crystal System
- Gold: Isometric; Quartz: Trigonal
- Color
- Gold: Golden yellow; Quartz: Colorless to white, grey, milky, smoky
- Luster
- Gold: Metallic; Quartz: Vitreous
- Transparency
- Gold: Opaque; Quartz: Transparent to translucent
- Fracture
- Gold: Hackly; Quartz: Conchoidal
- Cleavage
- Gold: None; Quartz: None
- Composition
- Gold: Native element (Au); Quartz: Silicon dioxide (SiO2)
Physical characteristics
- Crystal Habit: Gold: Dendritic, arborescent, wire-like, massive, scales, nuggets; Quartz: Prismatic, massive, granular
- Cleavage Type: Gold: None; Quartz: None
- Fracture Type: Gold: Hackly; Quartz: Conchoidal
- Tenacity: Gold: Malleable, ductile, sectile; Quartz: Brittle
- Luster Type: Gold: Metallic; Quartz: Vitreous
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